diff --git a/Makefile b/Makefile
index ae35e0b..8fcab06 100644
--- a/Makefile
+++ b/Makefile
@@ -1,16 +1,16 @@
-SOURCES = $(shell find . -name "*.go")
+sources = $(shell find . -name "*.go")
 
 default: build
 
-lib: $(SOURCES)
+lib: $(sources)
 	go build
 
 build: lib
 
-check: $(SOURCES) build
+check: $(sources) build
 	go test -count 1
 
-.cover: $(SOURCES) build
+.cover: $(sources) build
 	go test -count 1 -coverprofile .cover
 
 cover: .cover
@@ -19,7 +19,7 @@ cover: .cover
 showcover: .cover
 	go tool cover -html .cover
 
-fmt: $(SOURCES)
+fmt: $(sources)
 	go fmt
 
 clean: