diff --git a/Makefile b/Makefile
index 70339c6e8..832666889 100644
--- a/Makefile
+++ b/Makefile
@@ -214,7 +214,7 @@ minify: $(JSDSTFILES) $(CSSDSTFILES)
 #
 
 json:	$(MANAGERJSONDST)
-	-$(MAKE) minify
+	@if which yui-compressor; then $(MAKE) minify; fi
 
 $(MANAGERJSONDST):	$(MANAGERJSONSRC)
 	./scripts/jsongenerator.pl