diff --git a/Pilz.IO/FileLocker.cs b/Pilz.IO/FileLocker.cs
index 298d4f5..bb45ea5 100644
--- a/Pilz.IO/FileLocker.cs
+++ b/Pilz.IO/FileLocker.cs
@@ -41,7 +41,7 @@ namespace Pilz.IO
                             var fs = new FileStream(lockFile, FileMode.Open, FileAccess.Read);
                             fs.Close();
                         }
-                        catch (IOException ex)
+                        catch (IOException)
                         {
                             isLocked = true;
                         }