diff --git a/build/soong/Android.bp b/build/soong/Android.bp
index d7da046..36f0427 100644
--- a/build/soong/Android.bp
+++ b/build/soong/Android.bp
@@ -270,7 +270,7 @@ twrp {
             cflags: ["-DTWRP_EVENT_LOGGING"]
         },
         target_recovery_overscan_percent: {
-            cflags: ["-DOVERSCAN_PERCENT"]
+            cflags: ["-DOVERSCAN_PERCENT=%s"]
         },
         tw_screen_blank_on_boot: {
             cflags: ["-DTW_SCREEN_BLANK_ON_BOOT"]