diff --git a/Makefile b/Makefile
index 2a74eee..bd6be8d 100644
--- a/Makefile
+++ b/Makefile
@@ -3,9 +3,9 @@ build:
 	mkdir -p build
 	cp -r ./public/* ./build
 	cp ./thesis/main.pdf ./build/mt-polygon-simplification-2019.pdf
-	cd ./benchmarking && npm run build
+	cd ./benchmarking && npm install && npm run build
 	cp -r ./benchmarking/dist ./build/benchmarking
-	cd ./compare-algorithms && npm run build
+	cd ./compare-algorithms && npm install && npm run build
 	cp -r ./compare-algorithms/dist ./build/polygon-simplification
 
 clean: