diff --git a/xwords4/android/app/build.gradle b/xwords4/android/app/build.gradle
index ee9b3270d..9c61d9b5b 100644
--- a/xwords4/android/app/build.gradle
+++ b/xwords4/android/app/build.gradle
@@ -315,10 +315,6 @@ android {
     }
 }
 
-ext {
-    SUPPORT_LIB_VERSION = '28.0.0'
-}
-
 dependencies {
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     implementation 'androidx.core:core:1.0.0'