diff --git a/src/c4/charconv.hpp b/src/c4/charconv.hpp
index b1775c7..ffb6a61 100644
--- a/src/c4/charconv.hpp
+++ b/src/c4/charconv.hpp
@@ -159,10 +159,14 @@
 #if defined(__clang__)
 #define C4_NO_UBSAN_IOVRFLW __attribute__((no_sanitize("signed-integer-overflow")))
 #elif defined(__GNUC__)
+#if __GNUC__ > 7
 #define C4_NO_UBSAN_IOVRFLW __attribute__((no_sanitize("signed-integer-overflow")))
 #else
 #define C4_NO_UBSAN_IOVRFLW
 #endif
+#else
+#define C4_NO_UBSAN_IOVRFLW
+#endif
 
 
 namespace c4 {