diff --git a/app/utils/writer.c b/app/utils/writer.c
index be811c66..3a1772e9 100644
--- a/app/utils/writer.c
+++ b/app/utils/writer.c
@@ -196,6 +196,11 @@ enum zsv_writer_status zsv_writer_delete(zsv_csv_writer w) {
   if (w->started)
     w->out.write("\n", 1, 1, w->out.stream);
 
+  if (w->out.stream && w->out.stream != stdout) {
+    fclose(w->out.stream);
+    w->out.stream = NULL;
+  }
+
   if (w->out.buff)
     free(w->out.buff);
   free(w);