diff --git a/Makefile b/Makefile
index 3baed6a15ce9fb..a71d796fbe11f6 100644
--- a/Makefile
+++ b/Makefile
@@ -219,7 +219,7 @@ BINARYNAME=$(TARNAME)-$(PLATFORM)-$(ARCH)
 BINARYTAR=$(BINARYNAME).tar
 XZ=$(shell which xz > /dev/null 2>&1; echo $$?)
 PKG=out/$(TARNAME).pkg
-packagemaker=/Developer/Applications/Utilities/PackageMaker.app/Contents/MacOS/PackageMaker
+PACKAGEMAKER ?= /Developer/Applications/Utilities/PackageMaker.app/Contents/MacOS/PackageMaker
 
 PKGSRC=iojs-$(DESTCPU)-$(RAWVER).tgz
 ifdef NIGHTLY
@@ -270,7 +270,7 @@ $(PKG): release-only
 	mv $(PKGDIR)/usr/local/bin/iojs-universal $(PKGDIR)/usr/local/bin/iojs
 	rm -rf $(PKGDIR)/32
 	cat tools/osx-pkg.pmdoc/index.xml.tmpl | sed -e 's|__iojsversion__|'$(FULLVERSION)'|g' | sed -e 's|__npmversion__|'$(NPMVERSION)'|g' > tools/osx-pkg.pmdoc/index.xml
-	$(packagemaker) \
+	$(PACKAGEMAKER) \
 		--id "org.nodejs.Node" \
 		--doc tools/osx-pkg.pmdoc \
 		--out $(PKG)