diff --git a/Chino.Android/ExposureNotificationClient.cs b/Chino.Android/ExposureNotificationClient.cs
index 511f9a7..b5a1a03 100644
--- a/Chino.Android/ExposureNotificationClient.cs
+++ b/Chino.Android/ExposureNotificationClient.cs
@@ -62,7 +62,7 @@ public void Init(Context applicationContext)
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -96,7 +96,7 @@ public override async Task StartAsync()
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -119,7 +119,7 @@ public override async Task StopAsync()
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -142,7 +142,7 @@ public override async Task<bool> IsEnabledAsync()
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -165,7 +165,7 @@ public override async Task<long> GetVersionAsync()
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -189,7 +189,7 @@ public override async Task<IList<ExposureNotificationStatus>> GetStatusesAsync()
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -302,7 +302,7 @@ public override async Task<ProvideDiagnosisKeysResult> ProvideDiagnosisKeysAsync
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -326,7 +326,7 @@ public override async Task<List<TemporaryExposureKey>> GetTemporaryExposureKeyHi
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -406,7 +406,7 @@ public override async Task<ProvideDiagnosisKeysResult> ProvideDiagnosisKeysAsync
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 #pragma warning restore CS0618 // Type or member is obsolete
@@ -430,7 +430,7 @@ public override async Task RequestPreAuthorizedTemporaryExposureKeyHistoryAsync(
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -495,7 +495,7 @@ public override async Task RequestPreAuthorizedTemporaryExposureKeyReleaseAsync(
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
             finally
             {
diff --git a/Chino.Android/ExposureStateBroadcastReceiver.cs b/Chino.Android/ExposureStateBroadcastReceiver.cs
index 83c3fc8..d9aca5b 100644
--- a/Chino.Android/ExposureStateBroadcastReceiver.cs
+++ b/Chino.Android/ExposureStateBroadcastReceiver.cs
@@ -195,7 +195,7 @@ public override bool OnStartJob(JobParameters @params)
                         else
                         {
                             handler.ExceptionOccurred(exception);
-                            throw exception;
+                            throw;
                         }
                     }
                     finally
@@ -307,7 +307,7 @@ public override bool OnStartJob(JobParameters @params)
                         else
                         {
                             handler.ExceptionOccurred(exception);
-                            throw exception;
+                            throw;
                         }
                     }
                     finally
diff --git a/Chino.iOS/ExposureNotificationClient.cs b/Chino.iOS/ExposureNotificationClient.cs
index d283f89..930694a 100644
--- a/Chino.iOS/ExposureNotificationClient.cs
+++ b/Chino.iOS/ExposureNotificationClient.cs
@@ -66,7 +66,7 @@ public async Task ActivateAsync()
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
             finally
             {
@@ -108,7 +108,7 @@ public async override Task StartAsync()
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -126,7 +126,7 @@ public async override Task StopAsync()
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -144,7 +144,7 @@ public async override Task<bool> IsEnabledAsync()
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -171,7 +171,7 @@ public async override Task<IList<ExposureNotificationStatus>> GetStatusesAsync()
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -198,7 +198,7 @@ public async override Task<List<TemporaryExposureKey>> GetTemporaryExposureKeyHi
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -358,7 +358,7 @@ out NSProgress result
                 else
                 {
                     Handler.ExceptionOccurred(exception);
-                    throw exception;
+                    throw;
                 }
             }
             finally
@@ -452,7 +452,7 @@ public override async Task RequestPreAuthorizedTemporaryExposureKeyHistoryAsync(
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
 
@@ -476,7 +476,7 @@ public override async Task RequestPreAuthorizedTemporaryExposureKeyReleaseAsync(
                 {
                     throw exception.ToENException();
                 }
-                throw exception;
+                throw;
             }
         }
     }