diff --git a/configure.ac b/configure.ac
index 7ad2c14..92bca0d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -29,6 +29,7 @@ m4_ifdef([AC_USE_SYSTEM_EXTENSIONS], [AC_USE_SYSTEM_EXTENSIONS])
 AM_ICONV
 AM_GNU_GETTEXT([external])
 AM_GNU_GETTEXT_VERSION(0.18)
+AM_GNU_GETTEXT_REQUIRE_VERSION(0.18)
 
 # Checks for programs.
 AC_PROG_AWK