diff --git a/configure.ac b/configure.ac
index 49dc5c6..c5bb6f9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -9,7 +9,7 @@ AM_PATH_GTK_2_0([2.0.0])
 if test "x$GCC" = "xyes"; then
   AC_MSG_CHECKING([for usable gcc warning flags])
   gccwarningflags=
-  for flag in -Wall -Werror -ansi -pedantic; do
+  for flag in -Wall -Werror -std=c89 -pedantic; do
     ac_save_CFLAGS="$CFLAGS"
     ac_save_LIBS="$LIBS"
     CFLAGS="$CFLAGS$gccwarningflags $flag $GTK_CFLAGS"