diff --git a/Makefile b/Makefile
index c205846ae..b8be0f95f 100644
--- a/Makefile
+++ b/Makefile
@@ -55,4 +55,4 @@ PLACEHOLDER_NPM := "version": "0.0.0-develop"
 update_npmversion:
 	echo "Updating client-app version to: $(VERSION)"
 	grep '$(PLACEHOLDER_NPM)' website/package.json
-	sed -i '' 's/$(PLACEHOLDER_NPM)/"version": "$(VERSION)"/g' website/package.json
+	sed -i 's/$(PLACEHOLDER_NPM)/"version": "$(VERSION)"/g' website/package.json