diff --git a/generator/proto/app_compat_config.proto b/generator/proto/app_compat_config.proto
index f8065ea..b94b243 100644
--- a/generator/proto/app_compat_config.proto
+++ b/generator/proto/app_compat_config.proto
@@ -35,4 +35,5 @@ enum CompatChange {
   ALLOW_STORAGE_DYN_CODE_LOADING = 5;
   SUPPRESS_NATIVE_DEBUGGING_NOTIFICATION = 6;
   USE_ZYGOTE_SPAWNING = 7;
+  SPOOF_INSTALLER_CHECKS = 8; // see frameworks/base/core/java/android/app/InstallSourceSpoofingHooks.java
 }
diff --git a/generator/src/main/kotlin/ConfigGenerator.kt b/generator/src/main/kotlin/ConfigGenerator.kt
index 5c6a912..17656f8 100644
--- a/generator/src/main/kotlin/ConfigGenerator.kt
+++ b/generator/src/main/kotlin/ConfigGenerator.kt
@@ -216,7 +216,8 @@ fun CompatConfig.Builder.changes_(list: List<CompatChange>) {
 fun <T : ProtocolMessageEnum> enumBits(bits: List<T>): Long {
     var v = 0L
     bits.forEach {
-        check(it.number <= 63)
+        // bit 63 is reserved for AppInfoExt.HAS_COMPAT_CHANGES
+        check(it.number <= 62)
         v = v or (1L shl it.number)
     }
     return v