diff --git a/sound-compatible-4.18.h b/sound-compatible-4.18.h
index faed848..c9fe0f6 100644
--- a/sound-compatible-4.18.h
+++ b/sound-compatible-4.18.h
@@ -16,7 +16,7 @@
 #endif
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(5,4,0)
-#if __has_attribute(__fallthrough__)
+#if defined(__has_attribute) && __has_attribute(__fallthrough__)
 # define fallthrough                    __attribute__((__fallthrough__))
 #else
 # define fallthrough                    do {} while (0)  /* fallthrough */