diff --git a/include/image.mk b/include/image.mk
index 13b722981a..59204581d0 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -50,7 +50,7 @@ endif
 
 
 ifeq ($(CONFIG_TARGET_ROOTFS_EXT2FS),y)
-  E2SIZE=$(shell echo $$(($(CONFIG_TARGET_ROOTFS_SIZE)*1024)))
+  E2SIZE=$(shell echo $$(($(CONFIG_TARGET_ROOTFS_FSPART)*1024)))
   
   define Image/mkfs/ext2
 		$(STAGING_DIR)/bin/genext2fs -q -b $(E2SIZE) -I 1500 -d $(BUILD_DIR)/root/ $(KDIR)/root.ext2