diff --git a/include/nlohmann/detail/input/lexer.hpp b/include/nlohmann/detail/input/lexer.hpp
index 8c13cd6d8..3b9d409bf 100644
--- a/include/nlohmann/detail/input/lexer.hpp
+++ b/include/nlohmann/detail/input/lexer.hpp
@@ -656,194 +656,74 @@ class lexer : public lexer_base<BasicJsonType>
 
                 // invalid control characters
                 case 0x00:
-                {
-                    error_message = "invalid string: control character U+0000 (NUL) must be escaped to \\u0000";
-                    return token_type::parse_error;
-                }
-
                 case 0x01:
-                {
-                    error_message = "invalid string: control character U+0001 (SOH) must be escaped to \\u0001";
-                    return token_type::parse_error;
-                }
-
                 case 0x02:
-                {
-                    error_message = "invalid string: control character U+0002 (STX) must be escaped to \\u0002";
-                    return token_type::parse_error;
-                }
-
                 case 0x03:
-                {
-                    error_message = "invalid string: control character U+0003 (ETX) must be escaped to \\u0003";
-                    return token_type::parse_error;
-                }
-
                 case 0x04:
-                {
-                    error_message = "invalid string: control character U+0004 (EOT) must be escaped to \\u0004";
-                    return token_type::parse_error;
-                }
-
                 case 0x05:
-                {
-                    error_message = "invalid string: control character U+0005 (ENQ) must be escaped to \\u0005";
-                    return token_type::parse_error;
-                }
-
                 case 0x06:
-                {
-                    error_message = "invalid string: control character U+0006 (ACK) must be escaped to \\u0006";
-                    return token_type::parse_error;
-                }
-
                 case 0x07:
-                {
-                    error_message = "invalid string: control character U+0007 (BEL) must be escaped to \\u0007";
-                    return token_type::parse_error;
-                }
-
                 case 0x08:
-                {
-                    error_message = "invalid string: control character U+0008 (BS) must be escaped to \\u0008 or \\b";
-                    return token_type::parse_error;
-                }
-
                 case 0x09:
-                {
-                    error_message = "invalid string: control character U+0009 (HT) must be escaped to \\u0009 or \\t";
-                    return token_type::parse_error;
-                }
-
                 case 0x0A:
-                {
-                    error_message = "invalid string: control character U+000A (LF) must be escaped to \\u000A or \\n";
-                    return token_type::parse_error;
-                }
-
                 case 0x0B:
-                {
-                    error_message = "invalid string: control character U+000B (VT) must be escaped to \\u000B";
-                    return token_type::parse_error;
-                }
-
                 case 0x0C:
-                {
-                    error_message = "invalid string: control character U+000C (FF) must be escaped to \\u000C or \\f";
-                    return token_type::parse_error;
-                }
-
                 case 0x0D:
-                {
-                    error_message = "invalid string: control character U+000D (CR) must be escaped to \\u000D or \\r";
-                    return token_type::parse_error;
-                }
-
                 case 0x0E:
-                {
-                    error_message = "invalid string: control character U+000E (SO) must be escaped to \\u000E";
-                    return token_type::parse_error;
-                }
-
                 case 0x0F:
-                {
-                    error_message = "invalid string: control character U+000F (SI) must be escaped to \\u000F";
-                    return token_type::parse_error;
-                }
-
                 case 0x10:
-                {
-                    error_message = "invalid string: control character U+0010 (DLE) must be escaped to \\u0010";
-                    return token_type::parse_error;
-                }
-
                 case 0x11:
-                {
-                    error_message = "invalid string: control character U+0011 (DC1) must be escaped to \\u0011";
-                    return token_type::parse_error;
-                }
-
                 case 0x12:
-                {
-                    error_message = "invalid string: control character U+0012 (DC2) must be escaped to \\u0012";
-                    return token_type::parse_error;
-                }
-
                 case 0x13:
-                {
-                    error_message = "invalid string: control character U+0013 (DC3) must be escaped to \\u0013";
-                    return token_type::parse_error;
-                }
-
                 case 0x14:
-                {
-                    error_message = "invalid string: control character U+0014 (DC4) must be escaped to \\u0014";
-                    return token_type::parse_error;
-                }
-
                 case 0x15:
-                {
-                    error_message = "invalid string: control character U+0015 (NAK) must be escaped to \\u0015";
-                    return token_type::parse_error;
-                }
-
                 case 0x16:
-                {
-                    error_message = "invalid string: control character U+0016 (SYN) must be escaped to \\u0016";
-                    return token_type::parse_error;
-                }
-
                 case 0x17:
-                {
-                    error_message = "invalid string: control character U+0017 (ETB) must be escaped to \\u0017";
-                    return token_type::parse_error;
-                }
-
                 case 0x18:
-                {
-                    error_message = "invalid string: control character U+0018 (CAN) must be escaped to \\u0018";
-                    return token_type::parse_error;
-                }
-
                 case 0x19:
-                {
-                    error_message = "invalid string: control character U+0019 (EM) must be escaped to \\u0019";
-                    return token_type::parse_error;
-                }
-
                 case 0x1A:
-                {
-                    error_message = "invalid string: control character U+001A (SUB) must be escaped to \\u001A";
-                    return token_type::parse_error;
-                }
-
                 case 0x1B:
-                {
-                    error_message = "invalid string: control character U+001B (ESC) must be escaped to \\u001B";
-                    return token_type::parse_error;
-                }
-
                 case 0x1C:
-                {
-                    error_message = "invalid string: control character U+001C (FS) must be escaped to \\u001C";
-                    return token_type::parse_error;
-                }
-
                 case 0x1D:
-                {
-                    error_message = "invalid string: control character U+001D (GS) must be escaped to \\u001D";
-                    return token_type::parse_error;
-                }
-
                 case 0x1E:
-                {
-                    error_message = "invalid string: control character U+001E (RS) must be escaped to \\u001E";
-                    return token_type::parse_error;
-                }
-
                 case 0x1F:
                 {
-                    error_message = "invalid string: control character U+001F (US) must be escaped to \\u001F";
+                    static const char* const control_character_messages[32] =
+                    {
+                        "invalid string: control character U+0000 (NUL) must be escaped to \\u0000",
+                        "invalid string: control character U+0001 (SOH) must be escaped to \\u0001",
+                        "invalid string: control character U+0002 (STX) must be escaped to \\u0002",
+                        "invalid string: control character U+0003 (ETX) must be escaped to \\u0003",
+                        "invalid string: control character U+0004 (EOT) must be escaped to \\u0004",
+                        "invalid string: control character U+0005 (ENQ) must be escaped to \\u0005",
+                        "invalid string: control character U+0006 (ACK) must be escaped to \\u0006",
+                        "invalid string: control character U+0007 (BEL) must be escaped to \\u0007",
+                        "invalid string: control character U+0008 (BS) must be escaped to \\u0008 or \\b",
+                        "invalid string: control character U+0009 (HT) must be escaped to \\u0009 or \\t",
+                        "invalid string: control character U+000A (LF) must be escaped to \\u000A or \\n",
+                        "invalid string: control character U+000B (VT) must be escaped to \\u000B",
+                        "invalid string: control character U+000C (FF) must be escaped to \\u000C or \\f",
+                        "invalid string: control character U+000D (CR) must be escaped to \\u000D or \\r",
+                        "invalid string: control character U+000E (SO) must be escaped to \\u000E",
+                        "invalid string: control character U+000F (SI) must be escaped to \\u000F",
+                        "invalid string: control character U+0010 (DLE) must be escaped to \\u0010",
+                        "invalid string: control character U+0011 (DC1) must be escaped to \\u0011",
+                        "invalid string: control character U+0012 (DC2) must be escaped to \\u0012",
+                        "invalid string: control character U+0013 (DC3) must be escaped to \\u0013",
+                        "invalid string: control character U+0014 (DC4) must be escaped to \\u0014",
+                        "invalid string: control character U+0015 (NAK) must be escaped to \\u0015",
+                        "invalid string: control character U+0016 (SYN) must be escaped to \\u0016",
+                        "invalid string: control character U+0017 (ETB) must be escaped to \\u0017",
+                        "invalid string: control character U+0018 (CAN) must be escaped to \\u0018",
+                        "invalid string: control character U+0019 (EM) must be escaped to \\u0019",
+                        "invalid string: control character U+001A (SUB) must be escaped to \\u001A",
+                        "invalid string: control character U+001B (ESC) must be escaped to \\u001B",
+                        "invalid string: control character U+001C (FS) must be escaped to \\u001C",
+                        "invalid string: control character U+001D (GS) must be escaped to \\u001D",
+                        "invalid string: control character U+001E (RS) must be escaped to \\u001E",
+                        "invalid string: control character U+001F (US) must be escaped to \\u001F"
+                    };
+                    error_message = control_character_messages[static_cast<std::size_t>(current)];
                     return token_type::parse_error;
                 }