diff --git a/Makefile b/Makefile
index 664ed7b6..d64d260f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,17 +1,18 @@
-NPM_PREFIX=node_modules
+NPM_PREFIX=$(realpath node_modules)
+PATH:=${NPM_PREFIX}/.bin:${PATH}
 
 .PHONY: test
 test: setup styleguide-app/elm.js
-	${NPM_PREFIX}/.bin/elm-package diff
-	${NPM_PREFIX}/.bin/elm-format --validate src tests styleguide-app
-	${NPM_PREFIX}/.bin/elm-test
+	elm-package diff
+	elm-format --validate src tests styleguide-app
+	elm-test
 
 .PHONY: test
 clean:
 	rm -rf node_modules
 
 styleguide-app/elm.js: styleguide-app/elm-stuff $(glob styleguide-app/*.elm styleguide-app/**/*.elm)
-	cd styleguide-app; ../${NPM_PREFIX}/.bin/elm-make Main.elm --output=elm.js
+	cd styleguide-app; elm-make Main.elm --output=elm.js
 
 # plumbing
 
@@ -23,13 +24,13 @@ node_modules: package.json
 	touch -m $@
 
 elm-stuff: package.json node_modules
-	${NPM_PREFIX}/.bin/elm-package install --yes
+	elm-package install --yes
 	touch -m $@
 
 tests/elm-stuff: tests/elm-package.json node_modules
-	cd tests; ../${NPM_PREFIX}/.bin/elm-package install --yes
+	elm-package install --yes
 	touch -m $@
 
 styleguide-app/elm-stuff: styleguide-app/elm-package.json node_modules
-	cd styleguide-app; ../${NPM_PREFIX}/.bin/elm-package install --yes
+	cd styleguide-app; elm-package install --yes
 	touch -m $@