diff --git a/src/login.c b/src/login.c
index 80c54a8..ece1ee6 100644
--- a/src/login.c
+++ b/src/login.c
@@ -259,8 +259,8 @@ void env_xdg_session(const enum display_server display_server)
 
 void env_xdg(const char* tty_id, const char* desktop_name)
 {
-    char user[15];
-    snprintf(user, 15, "/run/user/%d", getuid());
+    char user[20];
+    snprintf(user, 20, "/run/user/%d", getuid());
     setenv("XDG_RUNTIME_DIR", user, 0);
     setenv("XDG_SESSION_CLASS", "user", 0);
     setenv("XDG_SESSION_ID", "1", 0);