diff --git a/Source/CPM3/Makefile b/Source/CPM3/Makefile
index bfb4d5f3..941f4cd9 100644
--- a/Source/CPM3/Makefile
+++ b/Source/CPM3/Makefile
@@ -28,6 +28,7 @@ clean:: biosclean
 	@rm -f bios3.spr bnkbios3.spr zpmbios3.spr cpmldr.com gencpm.dat options.lib ldropts.lib
 
 biosclean:
+	printenv
 	@rm -f $(BIOSOBJS)
 
 cpm3res: