diff --git a/src/com/android/certinstaller/CertInstallerMain.java b/src/com/android/certinstaller/CertInstallerMain.java
index 0b37953..4cec5fc 100644
--- a/src/com/android/certinstaller/CertInstallerMain.java
+++ b/src/com/android/certinstaller/CertInstallerMain.java
@@ -77,7 +77,8 @@
         setResult(RESULT_CANCELED);
 
         UserManager userManager = (UserManager) getSystemService(Context.USER_SERVICE);
-        if (userManager.hasUserRestriction(UserManager.DISALLOW_CONFIG_CREDENTIALS)) {
+        if (userManager.hasUserRestriction(UserManager.DISALLOW_CONFIG_CREDENTIALS)
+                || userManager.isGuestUser()) {
             finish();
             return;
         }