diff --git a/ProjectLighthouse.Tests/Unit/ModerationTests.cs b/ProjectLighthouse.Tests/Unit/ModerationTests.cs
index 49b42e15..9aa4055b 100644
--- a/ProjectLighthouse.Tests/Unit/ModerationTests.cs
+++ b/ProjectLighthouse.Tests/Unit/ModerationTests.cs
@@ -15,22 +15,22 @@ public class ModerationTests
     public async void DismissExpiredCases_ShouldDismissExpiredCase()
     {
         await using DatabaseContext database = await MockHelper.GetTestDatabase();
-        
+
         ModerationCaseEntity @case = new()
         {
             CaseId = 1,
             ExpiresAt = DateTime.UnixEpoch,
             CreatorUsername = "unitTestUser",
         };
-        
+
         database.Cases.Add(@case);
-        
+
         await database.SaveChangesAsync();
-        
+
         DismissExpiredCasesTask task = new();
         await task.Run(database);
 
-        Assert.Null(await database.Cases.FirstOrDefaultAsync(c => c.CaseId == 1 && c.DismissedAt == null));
+        Assert.NotNull(await database.Cases.FirstOrDefaultAsync(c => c.CaseId == 1 && c.DismissedAt != null));
     }
 
     [Fact]
@@ -54,4 +54,29 @@ public class ModerationTests
 
         Assert.NotNull(await database.Cases.FirstOrDefaultAsync(c => c.CaseId == 2 && c.DismissedAt == null));
     }
+
+    [Fact]
+    public async void DismissExpiredCases_ShouldNotDismissAlreadyDismissedCase()
+    {
+        await using DatabaseContext database = await MockHelper.GetTestDatabase();
+
+        ModerationCaseEntity @case = new()
+        {
+            CaseId = 3,
+            ExpiresAt = DateTime.UnixEpoch,
+            DismissedAt = DateTime.UnixEpoch,
+            CreatorUsername = "unitTestUser",
+        };
+
+        database.Cases.Add(@case);
+
+        await database.SaveChangesAsync();
+
+        DismissExpiredCasesTask task = new();
+        await task.Run(database);
+
+        // check that the case was not dismissed again by comparing original time to new time
+        Assert.NotNull(
+            await database.Cases.FirstOrDefaultAsync(c => c.CaseId == 3 && c.DismissedAt == DateTime.UnixEpoch));
+    }
 }
\ No newline at end of file
diff --git a/ProjectLighthouse/Administration/Maintenance/RepeatingTasks/DismissExpiredCasesTask.cs b/ProjectLighthouse/Administration/Maintenance/RepeatingTasks/DismissExpiredCasesTask.cs
index e38e5405..84b282ad 100644
--- a/ProjectLighthouse/Administration/Maintenance/RepeatingTasks/DismissExpiredCasesTask.cs
+++ b/ProjectLighthouse/Administration/Maintenance/RepeatingTasks/DismissExpiredCasesTask.cs
@@ -19,8 +19,9 @@ public class DismissExpiredCasesTask : IRepeatingTask
 
     public async Task Run(DatabaseContext database)
     {
-        List<ModerationCaseEntity> expiredCases =
-            await database.Cases.Where(c => c.ExpiresAt != null && c.ExpiresAt < DateTime.UtcNow).ToListAsync();
+        List<ModerationCaseEntity> expiredCases = await database.Cases
+            .Where(c => c.DismissedAt == null && c.ExpiresAt != null && c.ExpiresAt < DateTime.UtcNow)
+            .ToListAsync();
 
         if (expiredCases.Count == 0)
         {