diff --git a/scst/include/backport.h b/scst/include/backport.h
index 0358636d4..8ffa83254 100644
--- a/scst/include/backport.h
+++ b/scst/include/backport.h
@@ -246,7 +246,15 @@ static inline void cpu_to_be32_array(__be32 *dst, const u32 *src, size_t len)
  * pseudo keyword for switch/case use") # v5.4
  */
 #ifndef fallthrough
+#ifdef __has_attribute
+#if __has_attribute(__fallthrough__)
 #define fallthrough __attribute__((__fallthrough__))
+#else
+#define fallthrough do {} while (0)  /* fallthrough */
+#endif
+#else
+#define fallthrough do {} while (0)  /* fallthrough */
+#endif
 #endif
 
 /* <linux/cpumask.h> */