diff --git a/src/tests/Common/Coreclr.TestWrapper/MobileAppHandler.cs b/src/tests/Common/Coreclr.TestWrapper/MobileAppHandler.cs
index 71f5d42feba2e1716b7d4da42240f8614d958c14..7a80d1e2b3b7a04211a3143a94e38071ded385d9 100644
--- a/src/tests/Common/Coreclr.TestWrapper/MobileAppHandler.cs
+++ b/src/tests/Common/Coreclr.TestWrapper/MobileAppHandler.cs
@@ -104,9 +104,9 @@ private static void HandleMobileApp(string action, string platform, string categ
                     }
                     catch {}
 
-                    outputWriter.WriteLine("\ncmdLine:{0} Timed Out (timeout in milliseconds: {1}, start: {3}, end: {4})",
+                    outputWriter.WriteLine("\ncmdLine:{0} Timed Out (timeout in milliseconds: {1}, start: {2}, end: {3})",
                             cmdStr, timeout, startTime.ToString(), endTime.ToString());
-                    errorWriter.WriteLine("\ncmdLine:{0} Timed Out (timeout in milliseconds: {1}, start: {3}, end: {4})",
+                    errorWriter.WriteLine("\ncmdLine:{0} Timed Out (timeout in milliseconds: {1}, start: {2}, end: {3})",
                             cmdStr, timeout, startTime.ToString(), endTime.ToString());
                     
                     process.Kill(entireProcessTree: true);