diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c
index d70fc75691..a82f50f5fa 100644
--- a/libavformat/img2dec.c
+++ b/libavformat/img2dec.c
@@ -308,7 +308,7 @@ int ff_img_read_header(AVFormatContext *s1)
             int probe_buffer_size = 2048;
             uint8_t *probe_buffer = av_realloc(NULL, probe_buffer_size + AVPROBE_PADDING_SIZE);
             AVInputFormat *fmt = NULL;
-            AVProbeData pd;
+            AVProbeData pd = { 0 };
 
             if (!probe_buffer)
                 return AVERROR(ENOMEM);
diff --git a/tools/probetest.c b/tools/probetest.c
index b685e3d6c2..78327deda3 100644
--- a/tools/probetest.c
+++ b/tools/probetest.c
@@ -78,7 +78,7 @@ static void print_times(void)
 int main(int argc, char **argv)
 {
     unsigned int p, i, type, size, retry;
-    AVProbeData pd;
+    AVProbeData pd = { 0 };
     AVLFG state;
     PutBitContext pb;
     int retry_count= 4097;