diff --git a/test.c b/test.c
index 84adb63..dde5888 100644
--- a/test.c
+++ b/test.c
@@ -47,7 +47,7 @@ main (int argc, char **argv)
   pam_handle_t *pamh = NULL;
   int rc;
 
-  rc = pam_sm_authenticate (pamh, 0, 1, argv);
+  rc = pam_sm_authenticate (pamh, 0, 1, (const char **) argv);
 
   printf ("rc %d\n", rc);