diff --git a/libraries/AP_Scripting/lua/src/lundump.c b/libraries/AP_Scripting/lua/src/lundump.c
index 4b0f9a5ab9..ee86a91ed6 100644
--- a/libraries/AP_Scripting/lua/src/lundump.c
+++ b/libraries/AP_Scripting/lua/src/lundump.c
@@ -6,7 +6,7 @@
 
 #if defined(ARDUPILOT_BUILD)
 #pragma GCC diagnostic ignored "-Wfloat-equal"
-#if defined(__GNUC__) &&  __GNUC__ >= 7 || defined(__clang_major__) && __clang_major__ >= 11
+#if (defined(__GNUC__) &&  __GNUC__ >= 7 && __GNUC__ < 9) || (defined(__clang_major__) && __clang_major__ >= 11)
 #pragma GCC diagnostic ignored "-Wstring-plus-int"
 #endif
 #endif