diff --git a/rust/config/global.go b/rust/config/global.go
index 23230492f..8cc9d4cc0 100644
--- a/rust/config/global.go
+++ b/rust/config/global.go
@@ -53,6 +53,9 @@ var (
 		"--color=always",
 		"-Z dylib-lto",
 		"-Z link-native-libraries=no",
+
+		// cfg flag to indicate that we are building in AOSP with Soong
+		"--cfg soong",
 	}
 
 	LinuxHostGlobalLinkFlags = []string{