diff --git a/configure.ac b/configure.ac
index 187b9dd..8fba880 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,7 +27,6 @@ AM_MAINTAINER_MODE([enable])
 
 PKG_PROG_PKG_CONFIG
 AC_PROG_CC
-AC_ISC_POSIX
 AC_HEADER_STDC
 AM_PROG_LIBTOOL
 IT_PROG_INTLTOOL([0.40.0])