diff --git a/Src/Newtonsoft.Json/JsonPosition.cs b/Src/Newtonsoft.Json/JsonPosition.cs
index cbd32f92..1e2f0628 100644
--- a/Src/Newtonsoft.Json/JsonPosition.cs
+++ b/Src/Newtonsoft.Json/JsonPosition.cs
@@ -96,7 +96,7 @@ namespace Newtonsoft.Json
             {
                 message = message.Trim();
 
-                if (!message.EndsWith("."))
+                if (!message.EndsWith(".", StringComparison.Ordinal))
                     message += ".";
 
                 message += " ";
@@ -112,4 +112,4 @@ namespace Newtonsoft.Json
             return message;
         }
     }
-}
\ No newline at end of file
+}