diff --git a/Makefile b/Makefile
index 17a987b01..1f036bb61 100644
--- a/Makefile
+++ b/Makefile
@@ -188,6 +188,7 @@ cleanthirdparty:
 	rm -rf $(DJVUDIR)/build
 	rm -f $(MUPDFDIR)/fontdump.host
 	rm -f $(MUPDFDIR)/cmapdump.host
+	rm -rf $(POPENNSLIB)
 	$(MAKE) -C $(POPENNSDIR) clean
 
 $(MUPDFDIR)/fontdump.host: