diff --git a/core/string.c b/core/string.c
index 5b7c22e7..d159ea66 100644
--- a/core/string.c
+++ b/core/string.c
@@ -73,7 +73,7 @@ gchar *string_lowercase(const gchar *str)
 	*j = '\0';
 
 	g_strchomp(res);
-	return res;
+	return g_realloc(res, strlen(res) + 1);
 }
 
 int string_compare(const gchar *lhs, const gchar *rhs)