diff --git a/configure.in b/configure.in
index f41710293..5f9e4d7a6 100644
--- a/configure.in
+++ b/configure.in
@@ -1413,8 +1413,8 @@ if test "x$ac_cv_prog_gcc" = "xyes"; then
       ;;
     4.*)
       # Do not show warnings related to (char * | unsigned char *) type
-      # difference.
-      CFLAGS="$CFLAGS -fno-strict-aliasing -Wno-pointer-sign"
+      # difference. Do not show "always evaluate as true".
+      CFLAGS="$CFLAGS -fno-strict-aliasing -Wno-pointer-sign -Wno-always-true"
       ;;
     *)
       # These should be ok using -Werror