1 files changed, 4 insertions, 1 deletions
diff --git a/utf8.h b/utf8.h
index 1d172cd626..bd2526ba5d 100644
--- a/utf8.h
+++ b/utf8.h
@@ -917,7 +917,10 @@ representation.
  */
 #define UNICODE_REPLACEMENT		0xFFFD
 #define UNICODE_IS_REPLACEMENT(uv)  UNLIKELY((UV) (uv) == UNICODE_REPLACEMENT)
-#define UTF8_IS_REPLACEMENT(s, send) is_REPLACEMENT_utf8_safe(s,send)
+#define UTF8_IS_REPLACEMENT(s, send)                                        \
+    UNLIKELY(   ((send) - (s)) >= (sizeof(REPLACEMENT_CHARACTER_UTF8) - 1)  \
+             && memEQ((s), REPLACEMENT_CHARACTER_UTF8,                      \
+                      sizeof(REPLACEMENT_CHARACTER_UTF8) - 1))
 
 /* Max legal code point according to Unicode */
 #define PERL_UNICODE_MAX	0x10FFFF