diff --git a/contrib/MacOSX/config.h b/contrib/MacOSX/config.h
index 0da178dd..ba5e7e6a 100644
--- a/contrib/MacOSX/config.h
+++ b/contrib/MacOSX/config.h
@@ -115,6 +115,8 @@
 #define HAVE_PAM_AUTHENTICATE 1
 /* Define to 1 if you have the <pam/pam_appl.h> header file. */
 #define HAVE_PAM_PAM_APPL_H 1
+/* Mac OS X <10.6 doesn't have pam_fail_delay() */
+#define NO_PAM_FAIL_DELAY 1
 #endif
 
 /* -eof- */
diff --git a/src/ngircd/pam.c b/src/ngircd/pam.c
index e6d25bc5..0d4f27f0 100644
--- a/src/ngircd/pam.c
+++ b/src/ngircd/pam.c
@@ -111,7 +111,7 @@ PAM_Authenticate(CLIENT *Client) {
 
 	pam_set_item(pam, PAM_RUSER, Client_User(Client));
 	pam_set_item(pam, PAM_RHOST, Client_Hostname(Client));
-#ifdef HAVE_PAM_FAIL_DELAY
+#if defined(HAVE_PAM_FAIL_DELAY) && !defined(NO_PAM_FAIL_DELAY)
 	pam_fail_delay(pam, 0);
 #endif