diff --git a/Makefile b/Makefile
index 9525d41..5b6bd71 100644
--- a/Makefile
+++ b/Makefile
@@ -880,7 +880,7 @@
 
 .PHONY: libraries
 romlib.bin: libraries
-	${Q}${MAKE} BUILD_PLAT=${BUILD_PLAT} INCLUDES='${INCLUDES}' DEFINES='${DEFINES}' --no-print-directory -C ${ROMLIBPATH} all
+	${Q}${MAKE} PLAT_DIR=${PLAT_DIR} BUILD_PLAT=${BUILD_PLAT} INCLUDES='${INCLUDES}' DEFINES='${DEFINES}' --no-print-directory -C ${ROMLIBPATH} all
 
 cscope:
 	@echo "  CSCOPE"