diff --git a/src/libcharon/plugins/stroke/stroke_list.c b/src/libcharon/plugins/stroke/stroke_list.c
index 991bed116..1aa49ce0d 100644
--- a/src/libcharon/plugins/stroke/stroke_list.c
+++ b/src/libcharon/plugins/stroke/stroke_list.c
@@ -1093,6 +1093,7 @@ static void stroke_list_acerts(linked_list_t *list, bool utc, FILE *out)
 						if (str)
 						{
 							fprintf(out, "%s", str);
+							free(str);
 						}
 						else
 						{