diff --git a/dtool/Config.pp b/dtool/Config.pp
index 7ae99b6373..65dce9bd90 100644
--- a/dtool/Config.pp
+++ b/dtool/Config.pp
@@ -321,7 +321,8 @@
 // In general, it is safe to define these to be the same.  However,
 // don't define these to be '.', or you will be very sad the next time
 // you run 'make clean'.
-#defer ODIR Opt$[OPTIMIZE]-$[PLATFORM]
+#defer BC_VARIANT $[if $[USE_BOUNDSCHECKER],-bc]
+#defer ODIR Opt$[OPTIMIZE]$[BC_VARIANT]-$[PLATFORM]
 #defer ODIR_SHARED $[ODIR]
 #defer ODIR_STATIC $[ODIR]