diff --git a/acinclude.m4.in b/acinclude.m4.in
index d167c2c..29151a2 100644
--- a/acinclude.m4.in
+++ b/acinclude.m4.in
@@ -4478,7 +4478,7 @@ AC_DEFUN([KDE_PAM], [
         want_pam=yes
         pam_service=$withval
       fi
-    ], [ pam_service=kde ])
+    ], [ pam_service=tde ])
 
   use_pam=
   PAMLIBS=