diff --git a/scripts/unifdef-all.sh b/scripts/unifdef-all.sh
index d8b63521..ab77b25b 100755
--- a/scripts/unifdef-all.sh
+++ b/scripts/unifdef-all.sh
@@ -9,9 +9,7 @@ cd "$(git rev-parse --show-toplevel)" || exit
 
 git ls-files ./*.{h,cpp} | xargs unifdef \
 	-U WIN32 \
-	-U OS2 \
 	-U _WIN32 \
 	-U _WIN64 \
 	-U MACOSX \
-	-U C_DDRAW \
 	-m