diff --git a/src/util/umlaut.c b/src/util/umlaut.c
index 0bf7e0c34..1ba06a53e 100644
--- a/src/util/umlaut.c
+++ b/src/util/umlaut.c
@@ -181,7 +181,7 @@ void addtoken(void ** root, const char *str, variant id)
                 ref->ucs = lcs;
                 ref->node = node;
                 ref->nexthash = tk->next[index];
-                tk->next[index] = ref;
+                tk->next[index] = ref; // FIXME: memory leak of tk->next[index]
             }
             next = ref;
         }