diff --git a/arch/sandbox/lib/bootm.c b/arch/sandbox/lib/bootm.c
index 44ba8b5..8ed9237 100644
--- a/arch/sandbox/lib/bootm.c
+++ b/arch/sandbox/lib/bootm.c
@@ -89,3 +89,8 @@
 
 	return 1;
 }
+
+bool booti_is_valid(const void *img)
+{
+	return false;
+}