diff --git a/include/nlohmann/detail/input/string_scan.hpp b/include/nlohmann/detail/input/string_scan.hpp
index 11cf405d0..abe39e475 100644
--- a/include/nlohmann/detail/input/string_scan.hpp
+++ b/include/nlohmann/detail/input/string_scan.hpp
@@ -425,7 +425,7 @@ JSON_HEDLEY_ALWAYS_INLINE std::size_t string_bulk_run(const unsigned char* data,
     return scalar_string_bulk_run(data, n);
 }
 
-#if JSON_SCAN_NEON
+#if JSON_SCAN_NEON && !(defined(JSON_USE_SIMDUTF) && defined(JSON_HAS_CPP_17))
 /// scalar_string_bulk_run() from @a start on, out of line (see
 /// lexer_string_bulk_run())
 JSON_HEDLEY_NEVER_INLINE inline std::size_t string_bulk_run_from(const unsigned char* data, std::size_t start, std::size_t n) noexcept
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index e4df77677..ca00871d1 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -11883,7 +11883,7 @@ JSON_HEDLEY_ALWAYS_INLINE std::size_t string_bulk_run(const unsigned char* data,
     return scalar_string_bulk_run(data, n);
 }
 
-#if JSON_SCAN_NEON
+#if JSON_SCAN_NEON && !(defined(JSON_USE_SIMDUTF) && defined(JSON_HAS_CPP_17))
 /// scalar_string_bulk_run() from @a start on, out of line (see
 /// lexer_string_bulk_run())
 JSON_HEDLEY_NEVER_INLINE inline std::size_t string_bulk_run_from(const unsigned char* data, std::size_t start, std::size_t n) noexcept