diff --git a/configure.ac b/configure.ac
index 79c955c4..982632dc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4,6 +4,7 @@
 AC_PREREQ([2.67])
 LT_PREREQ([2.2.6])
 AC_INIT([aria2],[1.14.2],[t-tujikawa@users.sourceforge.net],[aria2],[http://aria2.sourceforge.net/])
+AC_USE_SYSTEM_EXTENSIONS
 LT_INIT()
 AC_CANONICAL_HOST
 AC_CANONICAL_TARGET
@@ -65,9 +66,6 @@ AM_CONDITIONAL([HAVE_ASCIIDOC], [ test "x$ASCIIDOC" != "x" ])
 # Setting language choice
 AC_LANG([C++])
 
-# Enable system extensions
-AC_USE_SYSTEM_EXTENSIONS
-
 # Check pkg-config is available
 PKG_PROG_PKG_CONFIG([0.20])