gistfile1.txt

index fa7a319..d215d3e 100644
--- a/src/frontend/results.c
+++ b/src/frontend/results.c
@@ -1898,8 +1898,8 @@ static void output_json(fs_query *q, int flags, FILE *out)
         GSList *it;
         int count = 0;
         for (it = q->warnings; it; it = it->next) {
-            if (count++) {
-                printf(", ");
+            if (it->next) {
+                fprintf(out, ", ");
             }
             char *text = it->data;
             char *escd = NULL;