diff --git a/Makefile b/Makefile
index df2c1a0..1cff80a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,22 +1,22 @@
 all: deps.svg deps.png deps.pdf
 
 deps.dot: deps.sh
-        mkdir -p $$(dirname $@)
+	mkdir -p $$(dirname $@)
 	sh $< > $@
 
 artifacts/deps.svg: deps.dot Makefile
-        mkdir -p $$(dirname $@)
+	mkdir -p $$(dirname $@)
 	dot -Tsvg $< > $@
 
 artifacts/deps.png: deps.dot Makefile
-        mkdir -p $$(dirname $@)
+	mkdir -p $$(dirname $@)
 	dot -Tpng $< > $@
 
 deps.ps: deps.dot Makefile
-        mkdir -p $$(dirname $@)
+	mkdir -p $$(dirname $@)
 	dot -Tps  $< > $@
 
 artifacts/deps.pdf: deps.ps Makefile
-        mkdir -p $$(dirname $@)
+	mkdir -p $$(dirname $@)
 	ps2pdf $< $@