diff --git a/SMLogging/FileTraceListener.cs b/SMLogging/FileTraceListener.cs
index c9b2ef1..3bc5d66 100644
--- a/SMLogging/FileTraceListener.cs
+++ b/SMLogging/FileTraceListener.cs
@@ -513,8 +513,8 @@ private string FormatFilePath(string path)
             namedArgs["DateTime"] = dateTime;
             namedArgs["Timestamp"] = DateTime.UtcNow.Ticks;
             namedArgs["ProcessId"] = _processId;
-            namedArgs["ProcessName"] = _processName;
-            namedArgs["AppName"] = _appName;
+            namedArgs["ProcessName"] = RemoveInvalidFileNameCharacters(_processName);
+            namedArgs["AppName"] = RemoveInvalidFileNameCharacters(_appName);
 
             return StringHelpers.NamedFormat(CultureInfo.InvariantCulture, path, namedArgs);
         }
@@ -648,6 +648,16 @@ private FileLockHandlerBase CreateLockHandler()
             }
         }
 
+        private static string RemoveInvalidFileNameCharacters(string value)
+        { 
+            foreach (var invalidChar in Path.GetInvalidFileNameChars())
+            {
+                value = value.Replace(invalidChar.ToString(), string.Empty);
+            }
+
+            return value;
+        }
+
         #endregion
 
         #region Private Fields