diff --git a/Master/rules.make b/Master/rules.make
index c03dc142..b7dd1d3f 100644
--- a/Master/rules.make
+++ b/Master/rules.make
@@ -237,7 +237,6 @@ $(MAKE) -f $(MAKEFILE_NAME) --no-print-directory --no-keep-going \
   MAIN_MODEL_FILE="$($(basename $(basename $*))_MAIN_MODEL_FILE)" \
   RESOURCE_DIRS="$($(basename $(basename $*))_RESOURCE_DIRS)" \
   BUNDLE_LIBS="$($(basename $(basename $*))_BUNDLE_LIBS) $(BUNDLE_LIBS)" \
-  PRINCIPAL_CLASS="$($(basename $(basename $*))_PRINCIPAL_CLASS)" \
   DLL_DEF="$($(basename $(basename $*))_DLL_DEF)" \
   ADDITIONAL_INCLUDE_DIRS="$(ADDITIONAL_INCLUDE_DIRS) \
 		$($(basename $(basename $*))_INCLUDE_DIRS)" \