diff --git a/doc/Makefile b/doc/Makefile
index 02066d859562bde736e4bc8c09fa3b6b4db97f45..e88ddf1df0dd35f25185304b919cf57c8cf8b0eb 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -232,7 +232,7 @@ $(MANPAGES_WEBDIR_LINUX) $(MANPAGES_WEBDIR_WINDOWS):
 %.txt: %
 	man ./$< > $@
 
-%.gz:
+%.gz: %
 	gzip -c ./$* > $@
 
 %.html: %