diff --git a/tests/checkasm/sw_scale.c b/tests/checkasm/sw_scale.c
index 2680e47897..9efa2b4def 100644
--- a/tests/checkasm/sw_scale.c
+++ b/tests/checkasm/sw_scale.c
@@ -53,7 +53,7 @@ static void check_hscale(void)
     struct SwsContext *ctx;
 
     // padded
-    LOCAL_ALIGNED_32(uint8_t, src, [SRC_PIXELS + MAX_FILTER_WIDTH - 1]);
+    LOCAL_ALIGNED_32(uint8_t, src, [FFALIGN(SRC_PIXELS + MAX_FILTER_WIDTH - 1, 4)]);
     LOCAL_ALIGNED_32(uint32_t, dst0, [SRC_PIXELS]);
     LOCAL_ALIGNED_32(uint32_t, dst1, [SRC_PIXELS]);