diff --git a/include/nlohmann/detail/meta/type_traits.hpp b/include/nlohmann/detail/meta/type_traits.hpp
index 9091fbe37..15aa88832 100644
--- a/include/nlohmann/detail/meta/type_traits.hpp
+++ b/include/nlohmann/detail/meta/type_traits.hpp
@@ -13,6 +13,7 @@
 #include <tuple> // tuple
 #include <type_traits> // false_type, is_constructible, is_integral, is_same, true_type
 #include <utility> // declval
+#include <vector> // vector
 #if defined(__cpp_lib_byte) && __cpp_lib_byte >= 201603L
     #include <cstddef> // byte
 #endif
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 674794bc7..e2afdda11 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -3593,6 +3593,7 @@ NLOHMANN_JSON_NAMESPACE_END
 #include <tuple> // tuple
 #include <type_traits> // false_type, is_constructible, is_integral, is_same, true_type
 #include <utility> // declval
+#include <vector> // vector
 #if defined(__cpp_lib_byte) && __cpp_lib_byte >= 201603L
     #include <cstddef> // byte
 #endif
diff --git a/tests/src/unit-regression2.cpp b/tests/src/unit-regression2.cpp
index 0035ecfb4..91dc10dbf 100644
--- a/tests/src/unit-regression2.cpp
+++ b/tests/src/unit-regression2.cpp
@@ -1140,7 +1140,7 @@ TEST_CASE("regression tests 2")
     {
         // Test that assigning a custom BinaryType directly creates a binary value, not an array
         const std::vector<std::byte> original{std::byte{1}, std::byte{2}, std::byte{3}};
-        json_4804 j = original;
+        const json_4804 j = original;
         CHECK(j.is_binary());
         CHECK(!j.is_array());
 
@@ -1149,7 +1149,7 @@ TEST_CASE("regression tests 2")
         CHECK(extracted == original);
 
         // Test that the default json alias behavior is unchanged: std::vector<uint8_t> -> array
-        json default_json = std::vector<std::uint8_t> {1, 2, 3};
+        const json default_json = std::vector<std::uint8_t> {1, 2, 3};
         CHECK(default_json.is_array());
         CHECK(!default_json.is_binary());
     }
@@ -1158,7 +1158,7 @@ TEST_CASE("regression tests 2")
     {
         // Test that extracting a custom BinaryType from a parsed JSON array still works
         // (not just from a binary-typed node)
-        auto j = json_4804::parse("[1,2,3]");
+        const auto j = json_4804::parse("[1,2,3]");
         CHECK(j.is_array());
         CHECK(!j.is_binary());