diff --git a/tools/lavfi-showfiltfmts.c b/tools/lavfi-showfiltfmts.c
index af7a181089..da3dc7b732 100644
--- a/tools/lavfi-showfiltfmts.c
+++ b/tools/lavfi-showfiltfmts.c
@@ -60,11 +60,13 @@ int main(int argc, char **argv)
 
     /* create a link for each of the input pads */
     for (i = 0; i < filter_ctx->input_count; i++) {
-        AVFilterLink *link = av_malloc(sizeof(AVFilterLink));
+        AVFilterLink *link = av_mallocz(sizeof(AVFilterLink));
+        link->type = filter_ctx->filter->inputs[i].type;
         filter_ctx->inputs[i] = link;
     }
     for (i = 0; i < filter_ctx->output_count; i++) {
-        AVFilterLink *link = av_malloc(sizeof(AVFilterLink));
+        AVFilterLink *link = av_mallocz(sizeof(AVFilterLink));
+        link->type = filter_ctx->filter->inputs[i].type;
         filter_ctx->outputs[i] = link;
     }