diff --git a/configure.in b/configure.in
index 1ebc46f5..3c0cce27 100644
--- a/configure.in
+++ b/configure.in
@@ -10,7 +10,6 @@ AC_CONFIG_SRCDIR([configure.in])
 
 AM_INIT_AUTOMAKE([1.9 dist-bzip2 subdir-objects no-define])
 
-AC_USE_SYSTEM_EXTENSIONS
 AM_MAINTAINER_MODE
 AC_PROG_CC
 AM_PROG_CC_C_O