diff --git a/configure.ac b/configure.ac
index bf87f5aa..7eb1bfe1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -21,7 +21,7 @@ AC_PATH_PROG(perlpath, perl)
 AC_CHECK_HEADERS(unistd.h dirent.h sys/ioctl.h sys/resource.h)
 
 # check posix headers..
-AC_CHECK_HEADERS(sys/socket.h sys/time.h sys/utsname.h regex.h)
+AC_CHECK_HEADERS(sys/socket.h sys/time.h sys/utsname.h)
 
 AC_SYS_LARGEFILE