diff --git a/Viewer/Makefile b/Viewer/Makefile
index 77382b58..bd94f46a 100644
--- a/Viewer/Makefile
+++ b/Viewer/Makefile
@@ -517,9 +517,9 @@ dev: ## Build the development environment
 dev: $(JS_FILES) $(NODE_DIR) $(PATCHES) css
 
 .PHONY: dev-npm
-dev-npm: ## Install the npm global dev package
+dev-npm: ## Install the npm global dev package (might need sudo)
 dev-npm: $(JS_FILES) $(PATCHES) css
-	npm install .
+	npm install -g .
 
 .PHONY: dist
 dist: ## Build distributable package