diff --git a/services/core/java/com/android/server/pm/PackageManagerService.java b/services/core/java/com/android/server/pm/PackageManagerService.java
index 50ac4db..9fce12c 100644
--- a/services/core/java/com/android/server/pm/PackageManagerService.java
+++ b/services/core/java/com/android/server/pm/PackageManagerService.java
@@ -23603,7 +23603,8 @@
 
         private SigningDetails getSigningDetails(int uid) {
             synchronized (mPackages) {
-                final Object obj = mSettings.getUserIdLPr(uid);
+                final int appId = UserHandle.getAppId(uid);
+                final Object obj = mSettings.getUserIdLPr(appId);
                 if (obj != null) {
                     if (obj instanceof SharedUserSetting) {
                         return ((SharedUserSetting) obj).signatures.mSigningDetails;