diff --git a/core/definitions.mk b/core/definitions.mk
index 189f7f71e..3d19e7290 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -2151,6 +2151,9 @@ endef
 # when requested.
 include $(BUILD_SYSTEM)/distdir.mk
 
+# Include any vendor specific definitions.mk file
+-include $(TOPDIR)vendor/*/build/core/definitions.mk
+
 # broken:
 #	$(foreach file,$^,$(if $(findstring,.a,$(suffix $file)),-l$(file),$(file)))