diff --git a/Makefile b/Makefile
index f7736145217d29f57b8de0d8595324447a497ad1..d8b4c0d9a79ba1c95e05f4611926e4d9346eda41 100644
--- a/Makefile
+++ b/Makefile
@@ -55,7 +55,7 @@ $(CSS_OBJ): www/less/map.less $(LESSC) $(LESSHAT) $(WDN_MIXINS)
 	$(LESSC) --clean-css $< $@
 	
 $(LESSC):
-	npm install less
+	npm install less@1.7.5
 
 $(LESS_LIB)/%.less:
 	@mkdir -p $(@D)