diff --git a/configure.ac b/configure.ac
index 5541ee69..652297bc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -279,7 +279,6 @@ AC_C_CONST
 AC_C_TYPEOF
 
 AC_TYPE_GETGROUPS
-AC_TYPE_MODE_T
 AC_TYPE_SIGNAL
 AC_TYPE_UID_T