diff --git a/doc/Makefile b/doc/Makefile
index d0caa58283cb5abf860d9ea9fa345f903eb3d44b..1a6658456bf3d926e0b12a5f2313dca45957a722 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -230,7 +230,7 @@ $(MANPAGES_WEBDIR_LINUX) $(MANPAGES_WEBDIR_WINDOWS):
 %.txt: %
 	man ./$< > $@
 
-%.gz:
+%.gz: %
 	gzip -c ./$* > $@
 
 %.html: %