diff --git a/doc/manual/local.mk b/doc/manual/local.mk
index 6b232a736..c1ce8aaeb 100644
--- a/doc/manual/local.mk
+++ b/doc/manual/local.mk
@@ -72,6 +72,7 @@ $(d)/builtins.json: $(bindir)/nix
 	@mv $@.tmp $@
 
 # Generate the HTML manual.
+html: $(docdir)/manual/index.html
 install: $(docdir)/manual/index.html
 
 # Generate 'nix' manpages.