diff --git a/pam/auth_client_test.cc b/pam/auth_client_test.cc
index b3f0352b507a724ddda78e1cc03348af7ecb033a..8f99bcae7b671817e6daeff22646e8c4ed263384 100644
--- a/pam/auth_client_test.cc
+++ b/pam/auth_client_test.cc
@@ -126,7 +126,8 @@ TEST_F(AuthClientTest, SSLFailsWithBadCAServerSide) {
 int main(int argc, char **argv) {
   server = getenv("AUTH_SERVER");
   if (server == NULL) {
-    server = "localhost:1617";
+    printf("This test requires a local auth server. Set the AUTH_SERVER environment variable to its address.\n");
+    exit(0);
   }
 
   ::testing::InitGoogleTest(&argc, argv);