diff --git a/make/doxygen.mk b/make/doxygen.mk
index 583cee5e..03c34110 100644
--- a/make/doxygen.mk
+++ b/make/doxygen.mk
@@ -61,7 +61,7 @@ upload.done: doxygen.done cpfiles.done
 	upload.sh $(DX_OUTPUT_DIR)/ $(UPLOAD_URL)
 
 clean.doxygen:
-	rm -rf $(DX_OUTPUT_DIR) *.done $(DX_UNTEMPLATED) $(DX_INCLUDE) *.bak default-*
+	rm -rf $(DX_OUTPUT_DIR) *.done $(DX_UNTEMPLATED) $(DX_INCLUDE) *.bak default-* doxygen.conf
 
 inst-dir.done:
 	$(INSTALL) -d -o $(DOCDIROWNER) -g $(DOCDIRGROUP) -m $(DOCDIRMODE) $(DX_INSTALL_DIR)