diff --git a/Makefile b/Makefile
index 3d6736b..5ca70f0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,3 @@
-GOVERSION := $(shell go version)
 RELEASE_DIR=bin
 REVISION=$(shell git rev-parse --verify HEAD | cut -c-6)
 
@@ -19,12 +18,10 @@ $(DIRNAME):
 ifndef VERSION
 	@echo '[ERROR] $$VERSION must be specified'
 	exit 255
-endif
-ifndef VERSION
 endif
 	@cd example/$(DIRNAME);\
 	go build -ldflags "-X main.revision=$(REVISION) -X main.version=$(VERSION)"
-	@mv example/$(DIRNAME)/$(DIRNAME).exe bin/$(DIRNAME)-v$(VERSION)-$(GOARCH).exe
+	@mv example/$(DIRNAME)/$(DIRNAME).exe bin/$(DIRNAME)-$(VERSION)-$(GOARCH).exe
 
 clean:
 	rm -rf $(RELEASE_DIR)/*