diff --git a/shadowsocks-csharp/Controller/Listener.cs b/shadowsocks-csharp/Controller/Listener.cs
index a1f316b8..b21e4f89 100755
--- a/shadowsocks-csharp/Controller/Listener.cs
+++ b/shadowsocks-csharp/Controller/Listener.cs
@@ -124,7 +124,7 @@ namespace Shadowsocks.Controller
             catch (ObjectDisposedException)
             {
             }
-            catch (Exception e)
+            catch (Exception)
             {
             }
             finally
@@ -137,7 +137,7 @@ namespace Shadowsocks.Controller
                 {
                     // do nothing
                 }
-                catch (Exception e)
+                catch (Exception)
                 {
                 }
             }
diff --git a/shadowsocks-csharp/Controller/UDPRelay.cs b/shadowsocks-csharp/Controller/UDPRelay.cs
index bad2e41b..beee8d85 100644
--- a/shadowsocks-csharp/Controller/UDPRelay.cs
+++ b/shadowsocks-csharp/Controller/UDPRelay.cs
@@ -108,7 +108,7 @@ namespace Shadowsocks.Controller
                 catch (ObjectDisposedException)
                 {
                 }
-                catch (Exception e)
+                catch (Exception)
                 {
                 }
                 finally
@@ -124,7 +124,7 @@ namespace Shadowsocks.Controller
                 catch (ObjectDisposedException)
                 {
                 }
-                catch (Exception e)
+                catch (Exception)
                 {
                 }
                 finally