diff --git a/configure.ac b/configure.ac
index f587b93c..047ffbbe 100644
--- a/configure.ac
+++ b/configure.ac
@@ -9,7 +9,6 @@ AM_INIT_AUTOMAKE([1.9 no-define foreign])
 
 AM_MAINTAINER_MODE
 
-AC_ISC_POSIX
 AC_PROG_CC
 AC_PROG_CPP
 AM_PROG_LIBTOOL