diff --git a/board/matrix_vision/mvblm7/Makefile b/board/matrix_vision/mvblm7/Makefile
index 879d794..1bc1d61 100644
--- a/board/matrix_vision/mvblm7/Makefile
+++ b/board/matrix_vision/mvblm7/Makefile
@@ -8,5 +8,5 @@
 
 extra-y := bootscript.img
 
-$(obj)bootscript.img:
-	@mkimage -T script -C none -n M7_script -d bootscript $@
+$(obj)/bootscript.img: $(src)/bootscript
+	@mkimage -T script -C none -n M7_script -d $< $@