diff --git a/Makefile b/Makefile
index 8f8e2e2..493138f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-SOURCES = $(shell find . -name "*.go")
+sources = $(shell find . -name "*.go")
 
 default: build
 
@@ -9,12 +9,12 @@ check:
 	@go test -count 1 ./...
 
 imports:
-	@goimports -w $(SOURCES)
+	@goimports -w $(sources)
 
 fmt:
-	@gofmt -w -s $(SOURCES)
+	@gofmt -w -s $(sources)
 
-.coverprofile: $(SOURCES)
+.coverprofile: $(sources)
 	@go test -count 1 -coverprofile .coverprofile
 
 cover: .coverprofile