diff --git a/scst/include/backport.h b/scst/include/backport.h
index 9aa63dbc6..194bd4bbf 100644
--- a/scst/include/backport.h
+++ b/scst/include/backport.h
@@ -240,6 +240,15 @@ static inline void cpu_to_be32_array(__be32 *dst, const u32 *src, size_t len)
 #define __percpu
 #endif
 
+/* <linux/compiler_attributes.h> */
+
+/* See also commit 294f69e662d1 ("compiler_attributes.h: Add 'fallthrough'
+ * pseudo keyword for switch/case use") # v5.4
+ */
+#ifndef fallthrough
+#define fallthrough __attribute__((__fallthrough__))
+#endif
+
 /* <linux/cpumask.h> */
 
 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 20) && !defined(BACKPORT_LINUX_CPUMASK_H)