diff --git a/htdocs/images/logo-janware/Makefile b/htdocs/images/logo-janware/Makefile
index b8fb500b..2606b2dc 100644
--- a/htdocs/images/logo-janware/Makefile
+++ b/htdocs/images/logo-janware/Makefile
@@ -1,6 +1,6 @@
 TOPDIR = ../../..
 
-SVG_GENERATE_FORMATS = svg
+SVG_GENERATE_FORMATS ?= svg
 
 include $(TOPDIR)/make/proj.mk
 include $(MODDIR)/make/svg.mk