diff --git a/SConstruct b/SConstruct
index 4ef302cac49b..e8f9ec2964b0 100644
--- a/SConstruct
+++ b/SConstruct
@@ -491,6 +491,7 @@ else:
     for x in platform_list:
         print("\t" + x)
     print("\nPlease run scons again with argument: platform=<string>")
+    sys.exit(255)
 
 
 screen = sys.stdout