diff --git a/sys/cddl/contrib/opensolaris/common/lz4/lz4.c b/sys/cddl/contrib/opensolaris/common/lz4/lz4.c
index ee7f1fbe99e..c21d51350c2 100644
--- a/sys/cddl/contrib/opensolaris/common/lz4/lz4.c
+++ b/sys/cddl/contrib/opensolaris/common/lz4/lz4.c
@@ -850,7 +850,7 @@ real_LZ4_compress(const char *source, char *dest, int isize, int osize)
 #if defined(_KERNEL) || defined(_FAKE_KERNEL)
 	void *ctx = kmem_cache_alloc(lz4_ctx_cache, KM_NOSLEEP);
 #else
-	void *ctx = malloc(sizeof(struct refTables));
+	void *ctx = calloc(1, sizeof(struct refTables));
 #endif
 	int result;