diff --git a/Makefile b/Makefile
index b15446a82b..66e57dfbf3 100644
--- a/Makefile
+++ b/Makefile
@@ -61,8 +61,8 @@ test: lint unittest
 
 BUNDLE_FLAGS=
 ifeq ($(OS),Windows_NT)
-	fuo_version=$( echo 'print(__import__("feeluown").__version__, end="")' | python | tr -c '[:digit:]' '.')
-	create-version-file .metadata.yml --version $fuo_version
+	fuo_version=$( echo 'print(__import__("feeluown").__version__, end="")' | python | tr -c '[:digit:]' '.' )
+	create-version-file .metadata.yml --version ${fuo_version}
 	BUNDLE_FLAGS += --name FeelUOwn
 	BUNDLE_FLAGS += --icon feeluown/gui/assets/icons/feeluown.ico
 	BUNDLE_FLAGS += --version-file version_file.txt