diff --git a/libswscale/swscale-example.c b/libswscale/swscale-example.c
index 1b4be8db3d..e89930ff81 100644
--- a/libswscale/swscale-example.c
+++ b/libswscale/swscale-example.c
@@ -51,9 +51,9 @@ static uint64_t getSSD(uint8_t *src1, uint8_t *src2, int stride1, int stride2, i
 // ref & out are YV12
 static int doTest(uint8_t *ref[4], int refStride[4], int w, int h, int srcFormat, int dstFormat,
                   int srcW, int srcH, int dstW, int dstH, int flags){
-    uint8_t *src[4];
-    uint8_t *dst[4];
-    uint8_t *out[4];
+    uint8_t *src[4] = {0};
+    uint8_t *dst[4] = {0};
+    uint8_t *out[4] = {0};
     int srcStride[4], dstStride[4];
     int i;
     uint64_t ssdY, ssdU, ssdV, ssdA=0;