diff --git a/modfetch.c b/modfetch.c
index fd24bdd..dfd6d3e 100644
--- a/modfetch.c
+++ b/modfetch.c
@@ -110,6 +110,7 @@ char *resolve_env_vars(const char *str) {
         ret[ret_offset] = str[i];
         ret_offset += 1;
     }
+    ret[ret_offset] = '\0';
 
     return ret;
 }