diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 4de52eb5b93b..7e7d229bd638 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -879,11 +879,14 @@ static void kmem_cache_invalid_free(struct kunit *test)
 	kmem_cache_destroy(cache);
 }
 
+static void empty_cache_ctor(void *object) { }
+
 static void kmem_cache_double_destroy(struct kunit *test)
 {
 	struct kmem_cache *cache;
 
-	cache = kmem_cache_create("test_cache", 200, 0, 0, NULL);
+	/* Provide a constructor to prevent cache merging. */
+	cache = kmem_cache_create("test_cache", 200, 0, 0, empty_cache_ctor);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cache);
 	kmem_cache_destroy(cache);
 	KUNIT_EXPECT_KASAN_FAIL(test, kmem_cache_destroy(cache));