diff --git a/Marlin/src/core/mstring.h b/Marlin/src/core/mstring.h
index f78ba601b1..9606fa22af 100644
--- a/Marlin/src/core/mstring.h
+++ b/Marlin/src/core/mstring.h
@@ -73,7 +73,7 @@ extern void SERIAL_CHAR(char c);
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 
-#if DISABLED(UNSAFE_MSTRING)
+#if DISABLED(UNSAFE_MSTRING) && GCC_VERSION >= 80000
   #pragma GCC diagnostic ignored "-Wstringop-truncation"
 #endif