diff --git a/GNUmakefile b/GNUmakefile
index 7d1fa102..d697db0a 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -1093,7 +1093,7 @@ out/tildefriends-x86_64.AppImage: out/release/tildefriends out/data.zip
 	@echo "#!/bin/sh\n\$${APPDIR}/usr/bin/tildefriends run -z \$$APPDIR/usr/share/tildefriends/data.zip" > out/tildefriends.AppDir/AppRun
 	@chmod +x out/tildefriends.AppDir/AppRun
 	@cd out; ./appimagetool --appimage-extract; cd ..
-	@unset SOURCE_DATE_EPOCH; PATH=$$PATH:out/squashfs-root/usr/bin ARCH=x86_64 out/squashfs-root/usr/bin/appimagetool out/tildefriends.AppDir out/tildefriends-x86_64.AppImage
+	@cd out; unset SOURCE_DATE_EPOCH; PATH=$$PATH:squashfs-root/usr/bin ARCH=x86_64 squashfs-root/usr/bin/appimagetool -u 'zsync|https://dev.tildefriends.net/releases/tildefriends-x86_64.AppImage.zsync' tildefriends.AppDir tildefriends-x86_64.AppImage; cd ..
 
 appimage: out/tildefriends-x86_64.AppImage
 .PHONY: appimage