diff --git a/lib/url.c b/lib/url.c
index 3f385249740c3b70d7df67317d06a52bfce805b8..7f42474c47e88cf4f17f58ad2ed3b6c2197408de 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -173,7 +173,7 @@ static void conn_free(struct connectdata *conn);
 extern sigjmp_buf curl_jmpenv;
 #endif
 
-#ifdef SIGALARM
+#ifdef SIGALRM
 static
 RETSIGTYPE alarmfunc(int sig)
 {