diff --git a/services/core/java/com/android/server/StorageManagerService.java b/services/core/java/com/android/server/StorageManagerService.java
index db2a7331bd7f1..25e107642d042 100644
--- a/services/core/java/com/android/server/StorageManagerService.java
+++ b/services/core/java/com/android/server/StorageManagerService.java
@@ -3669,6 +3669,8 @@ class StorageManagerService extends IStorageManager.Stub
                     == PERMISSION_GRANTED || mIAppOpsService.checkOperation(
                             OP_REQUEST_INSTALL_PACKAGES, uid, packageName) == MODE_ALLOWED) {
                 return Zygote.MOUNT_EXTERNAL_INSTALLER;
+            } else if (mPmInternal.isInstantApp(packageName, UserHandle.getUserId(uid))) {
+                return Zygote.MOUNT_EXTERNAL_NONE;
             } else {
                 return Zygote.MOUNT_EXTERNAL_WRITE;
             }