diff --git a/doc/Makefile b/doc/Makefile
index f23df458..50500b17 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -95,6 +95,7 @@ clean:
 	rm -f repmgr.html
 	rm -f repmgr-A4.pdf
 	rm -f repmgr-US.pdf
+	rm -f *.fo
 	rm -f html/*
 
 maintainer-clean: