diff --git a/intern/cycles/util/util_defines.h b/intern/cycles/util/util_defines.h
index 429cfe647ef..2cb42d9bd56 100644
--- a/intern/cycles/util/util_defines.h
+++ b/intern/cycles/util/util_defines.h
@@ -69,10 +69,12 @@
 #  endif  /* _WIN32 && !FREE_WINDOWS */
 
 /* Use to suppress '-Wimplicit-fallthrough' (in place of 'break'). */
-#  if defined(__GNUC__) && (__GNUC__ >= 7)  /* gcc7.0+ only */
-#    define ATTR_FALLTHROUGH __attribute__((fallthrough))
-#  else
-#    define ATTR_FALLTHROUGH ((void) 0)
+#  ifndef ATTR_FALLTHROUGH
+#    if defined(__GNUC__) && (__GNUC__ >= 7)  /* gcc7.0+ only */
+#      define ATTR_FALLTHROUGH __attribute__((fallthrough))
+#    else
+#      define ATTR_FALLTHROUGH ((void) 0)
+#    endif
 #  endif
 #endif  /* __KERNEL_GPU__ */