diff --git a/doc/Makefile b/doc/Makefile
index 17d394a99a..c1f299a2f7 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -57,7 +57,7 @@ help:
 # ------------------------------------------
 
 clean-all: clean
-	rm -rf $(BUILDDIR)/docenv $(BUILDDIR)/doctrees $(BUILDDIR)/mathjax
+	rm -rf $(BUILDDIR)/docenv $(BUILDDIR)/doctrees $(BUILDDIR)/mathjax Manual.pdf Developer.pdf
 
 clean: clean-spelling
 	rm -rf html epub latex