diff --git a/scst/include/backport.h b/scst/include/backport.h
index 7588b5f33..470740508 100644
--- a/scst/include/backport.h
+++ b/scst/include/backport.h
@@ -905,9 +905,8 @@ static inline void *kvzalloc(size_t size, gfp_t flags)
 }
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0) &&			\
-       (!defined(MOFED_MAJOR) || !defined(MOFED_MINOR) ||		\
-	MOFED_MAJOR -0 < 4 || (MOFED_MAJOR -0 == 4 && MOFED_MINOR -0 < 5))
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 18, 0) &&	\
+	!defined(_COMPAT_LINUX_MM_H)
 /* See also commit 1c542f38ab8d ("mm: Introduce kvcalloc()") # v4.18. */
 static inline void *kvcalloc(size_t n, size_t size, gfp_t flags)
 {
@@ -1334,7 +1333,8 @@ static inline void sg_unmark_end(struct scatterlist *sg)
 	(__flags), NULL, NULL)
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0) &&	\
+	!defined(_COMPAT_LINUX_MM_H)
 /*
  * See also commit 3942d2991852 ("mm/slab_common: allow NULL cache pointer in
  * kmem_cache_destroy()") # v4.3.