diff --git a/Makefile b/Makefile
index 5330a71..9e4acd5 100644
--- a/Makefile
+++ b/Makefile
@@ -3,5 +3,5 @@ SHELL := /bin/bash
 
 build:
 	jupyter nbconvert --to interact notebook.ipynb
-  mv notebook.html index.html
+	mv notebook.html index.html
 .PHONY: build