diff --git a/book/Makefile b/book/Makefile
index a8776a5..63b6cb7 100644
--- a/book/Makefile
+++ b/book/Makefile
@@ -16,7 +16,7 @@ BUILDDIR      = build
 help:
 	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
 
-html-linkcheck: html
+html-linkcheck: clean html
 	@$(LYCHEE) "$(BUILDDIR)/html/"*.html
 
 .PHONY: help Makefile