diff --git a/configure.ac b/configure.ac
index 10e2a99a..62d13034 100644
--- a/configure.ac
+++ b/configure.ac
@@ -95,7 +95,7 @@ AM_CONDITIONAL([HAVE_MAKEINFO], [test -n "${MAKEINFO_PROG}"])
 
 # Initialize gettext.
 AM_GNU_GETTEXT([external])
-AM_GNU_GETTEXT_VERSION([0.22.5])
+AM_GNU_GETTEXT_VERSION([0.21])
 AM_CONDITIONAL([USE_NLS], [test "x${USE_NLS}" = "xyes"])
 
 # Configure C++ compiler