diff --git a/configure.in b/configure.in
index 2f2af6e..e25b7fe 100644
--- a/configure.in
+++ b/configure.in
@@ -7,6 +7,7 @@ AC_CANONICAL_TARGET
 AM_INIT_AUTOMAKE(csmash, 0.6.6)
 AM_CONFIG_HEADER(config.h)
 AM_GNU_GETTEXT([external])
+AM_GNU_GETTEXT_REQUIRE_VERSION([0.21])
 
 AC_CHECK_FUNCS(bind_textdomain_codeset)