diff --git a/build.sh b/build.sh
index 4d6806d..ad2fa89 100755
--- a/build.sh
+++ b/build.sh
@@ -2,8 +2,8 @@
 
 cp config.mk patches.h dwm-flexipatch/
 flexipatch-finalizer/flexipatch-finalizer.sh -r -d dwm-flexipatch -o dwm-final
-rm dwm-flexipatch/config.mk dwm-flexipatch/patches.h
-for patch in patches/*.patch; do
+git -C dwm-flexipatch reset --hard HEAD && git -C dwm-flexipatch clean -fd
+for patch in patches/*.diff; do
 	patch -d dwm-final <"$patch"
 done
 cp config.h dwm-final/
diff --git a/patches/autostart_signal.patch b/patches/autostart_signal.diff
similarity index 100%
rename from patches/autostart_signal.patch
rename to patches/autostart_signal.diff