diff --git a/sound-compatible-4.18.h b/sound-compatible-4.18.h
index faed848..eefa7de 100644
--- a/sound-compatible-4.18.h
+++ b/sound-compatible-4.18.h
@@ -16,6 +16,10 @@
 #endif
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(5,4,0)
+#ifndef __has_attribute
+# define __has_attribute(x) __GCC4_has_attribute_##x
+# define __GCC4_has_attribute___fallthrough__         0
+#endif
 #if __has_attribute(__fallthrough__)
 # define fallthrough                    __attribute__((__fallthrough__))
 #else