diff --git a/services/core/java/com/android/server/pm/PackageInstallerService.java b/services/core/java/com/android/server/pm/PackageInstallerService.java
index 617561a58351b..d23ea169e1cce 100644
--- a/services/core/java/com/android/server/pm/PackageInstallerService.java
+++ b/services/core/java/com/android/server/pm/PackageInstallerService.java
@@ -706,7 +706,7 @@ public class PackageInstallerService extends IPackageInstaller.Stub implements
             }
         }
 
-        if (Build.IS_DEBUGGABLE || isCalledBySystemOrShell(callingUid)) {
+        if (Build.IS_DEBUGGABLE || isCalledBySystem(callingUid)) {
             params.installFlags |= PackageManager.INSTALL_ALLOW_DOWNGRADE;
         } else {
             params.installFlags &= ~PackageManager.INSTALL_ALLOW_DOWNGRADE;
@@ -916,6 +916,10 @@ public class PackageInstallerService extends IPackageInstaller.Stub implements
         return sessionId;
     }
 
+    private static boolean isCalledBySystem(int callingUid) {
+        return callingUid == Process.SYSTEM_UID || callingUid == Process.ROOT_UID;
+    }
+
     private boolean isCalledBySystemOrShell(int callingUid) {
         return callingUid == Process.SYSTEM_UID || callingUid == Process.ROOT_UID
                 || callingUid == Process.SHELL_UID;