diff --git a/sys/contrib/zstd/lib/freebsd/stdlib.h b/sys/contrib/zstd/lib/freebsd/stdlib.h
index e20bc72089c5..33c17f023fde 100644
--- a/sys/contrib/zstd/lib/freebsd/stdlib.h
+++ b/sys/contrib/zstd/lib/freebsd/stdlib.h
@@ -35,6 +35,7 @@
 
 MALLOC_DECLARE(M_ZSTD);
 
+#undef malloc
 #define	malloc(x)	(malloc)((x), M_ZSTD, M_WAITOK)
 #define	free(x)		(free)((x), M_ZSTD)
 #define	calloc(a, b)	(mallocarray)((a), (b), M_ZSTD, M_WAITOK | M_ZERO)
diff --git a/sys/kern/kern_malloc.c b/sys/kern/kern_malloc.c
index 93664e5476bb..50dfe2507b62 100644
--- a/sys/kern/kern_malloc.c
+++ b/sys/kern/kern_malloc.c
@@ -549,7 +549,7 @@ malloc_dbg(caddr_t *vap, size_t *sizep, struct malloc_type *mtp,
  *	the allocation fails.
  */
 void *
-malloc(size_t size, struct malloc_type *mtp, int flags)
+(malloc)(size_t size, struct malloc_type *mtp, int flags)
 {
 	int indx;
 	caddr_t va;
diff --git a/sys/netinet/libalias/alias_mod.h b/sys/netinet/libalias/alias_mod.h
index ff2322f9324d..781366b14ef6 100644
--- a/sys/netinet/libalias/alias_mod.h
+++ b/sys/netinet/libalias/alias_mod.h
@@ -41,6 +41,7 @@ MALLOC_DECLARE(M_ALIAS);
 
 /* Use kernel allocator. */
 #if defined(_SYS_MALLOC_H_)
+#undef malloc
 #define	malloc(x)	malloc(x, M_ALIAS, M_NOWAIT|M_ZERO)
 #define	calloc(n, x)	mallocarray((n), (x), M_ALIAS, M_NOWAIT|M_ZERO)
 #define	free(x)		free(x, M_ALIAS)
diff --git a/sys/sys/malloc.h b/sys/sys/malloc.h
index 09c3be644967..62431510947a 100644
--- a/sys/sys/malloc.h
+++ b/sys/sys/malloc.h
@@ -38,6 +38,9 @@
 #define	_SYS_MALLOC_H_
 
 #include <sys/param.h>
+#ifdef _KERNEL
+#include <sys/systm.h>
+#endif
 #include <sys/queue.h>
 #include <sys/_lock.h>
 #include <sys/_mutex.h>
@@ -183,6 +186,22 @@ void	free(void *addr, struct malloc_type *type);
 void	free_domain(void *addr, struct malloc_type *type);
 void	*malloc(size_t size, struct malloc_type *type, int flags) __malloc_like
 	    __result_use_check __alloc_size(1);
+#ifdef _KERNEL
+#define	malloc(size, type, flags) ({					\
+	void *_malloc_item;						\
+	size_t _size = (size);						\
+	if (__builtin_constant_p(size) && __builtin_constant_p(flags) &&\
+	    ((flags) & M_ZERO)) {					\
+		_malloc_item = malloc(_size, type, (flags) &~ M_ZERO);	\
+		if (((flags) & M_WAITOK) || _malloc_item != NULL)	\
+			bzero(_malloc_item, _size);			\
+	} else {							\
+		_malloc_item = malloc(_size, type, flags);		\
+	}								\
+	_malloc_item;							\
+})
+#endif
+
 void	*malloc_domain(size_t size, struct malloc_type *type, int domain,
 	    int flags) __malloc_like __result_use_check __alloc_size(1);
 void	*mallocarray(size_t nmemb, size_t size, struct malloc_type *type,