diff --git a/android/build.gradle b/android/build.gradle
index 0d88a27..e63eefc 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -23,10 +23,12 @@ rootProject.allprojects {
 
 apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
+def safeExtGet(prop, fallback) {
+    rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
+}
 
 android {
-    compileSdkVersion 30
-
+    compileSdkVersion safeExtGet('compileSdkVersion', 30)
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
         test.java.srcDirs += 'src/test/kotlin'