diff --git a/src/libotutil/ot-variant-utils.c b/src/libotutil/ot-variant-utils.c
index 9d4a62d2..315bbeb2 100644
--- a/src/libotutil/ot-variant-utils.c
+++ b/src/libotutil/ot-variant-utils.c
@@ -157,6 +157,7 @@ variant_map_data_destroy (gpointer data)
 {
   VariantMapData *mdata = data;
   (void) munmap (mdata->addr, mdata->len);
+  g_free (mdata);
 }
 
 gboolean