diff --git a/target/sdk/files/Config.in b/target/sdk/files/Config.in
index 064cb0527bb..0614f31d604 100644
--- a/target/sdk/files/Config.in
+++ b/target/sdk/files/Config.in
@@ -18,6 +18,10 @@ menu "Global build settings"
 
 endmenu
 
+config IN_SDK
+	default y
+	bool
+
 config MODULES
 	bool
 	default y