diff --git a/app/Service/MemberService.php b/app/Service/MemberService.php
index 27e339e8..1b8d3687 100644
--- a/app/Service/MemberService.php
+++ b/app/Service/MemberService.php
@@ -159,6 +159,13 @@ class MemberService
 
     public function assignOrganizationEntitiesToDifferentMember(Organization $organization, Member $fromMember, Member $toMember): void
     {
+        // Running time entries are deleted instead of moved, since $toMember could already have a running time entry
+        TimeEntry::query()
+            ->whereBelongsTo($organization, 'organization')
+            ->whereBelongsTo($fromMember, 'member')
+            ->whereNull('end')
+            ->delete();
+
         // Time entries
         TimeEntry::query()
             ->whereBelongsTo($organization, 'organization')
diff --git a/tests/Unit/Endpoint/Api/V1/MemberEndpointTest.php b/tests/Unit/Endpoint/Api/V1/MemberEndpointTest.php
index 7ee0bfec..80c4e29c 100644
--- a/tests/Unit/Endpoint/Api/V1/MemberEndpointTest.php
+++ b/tests/Unit/Endpoint/Api/V1/MemberEndpointTest.php
@@ -390,6 +390,40 @@ class MemberEndpointTest extends ApiEndpointTestAbstract
         ]);
     }
 
+    public function test_merge_into_deletes_running_time_entries_of_source_member(): void
+    {
+        // Arrange
+        $data = $this->createUserWithPermission([
+            'members:merge-into',
+        ]);
+        $userSource = User::factory()->placeholder()->create();
+        $memberSource = Member::factory()->forUser($userSource)->forOrganization($data->organization)->role(Role::Placeholder)->create();
+        $runningTimeEntrySource = TimeEntry::factory()->forOrganization($data->organization)->forMember($memberSource)->active()->create();
+        TimeEntry::factory()->forOrganization($data->organization)->forMember($memberSource)->createMany(2);
+
+        $userDestination = User::factory()->create();
+        $memberDestination = Member::factory()->forUser($userDestination)->forOrganization($data->organization)->role(Role::Admin)->create();
+        $runningTimeEntryDestination = TimeEntry::factory()->forOrganization($data->organization)->forMember($memberDestination)->active()->create();
+        Passport::actingAs($data->user);
+
+        // Act
+        $response = $this->postJson(route('api.v1.members.merge-into', [$data->organization->getKey(), $memberSource->getKey()]), [
+            'member_id' => $memberDestination->getKey(),
+        ]);
+
+        // Assert
+        $response->assertStatus(204);
+        $this->assertDatabaseMissing(Member::class, [
+            'id' => $memberSource->getKey(),
+        ]);
+        $this->assertDatabaseMissing(TimeEntry::class, [
+            'id' => $runningTimeEntrySource->getKey(),
+        ]);
+        $memberDestination->refresh();
+        $this->assertCount(3, $memberDestination->timeEntries);
+        $this->assertSame([$runningTimeEntryDestination->getKey()], TimeEntry::query()->whereBelongsTo($userDestination, 'user')->whereNull('end')->pluck('id')->all());
+    }
+
     public function test_merge_into_assigns_resources_of_source_member_to_destination_member_and_deletes_member_with_existing_destination_resources(): void
     {
         // Arrange
diff --git a/tests/Unit/Service/MemberServiceTest.php b/tests/Unit/Service/MemberServiceTest.php
index 830e101e..8d487742 100644
--- a/tests/Unit/Service/MemberServiceTest.php
+++ b/tests/Unit/Service/MemberServiceTest.php
@@ -228,6 +228,30 @@ class MemberServiceTest extends TestCaseWithDatabase
         $this->assertSame(0, ProjectMember::query()->whereBelongsTo($fromUserMember, 'member')->count());
     }
 
+    public function test_assign_organization_entities_to_different_member_deletes_running_time_entries_of_the_member(): void
+    {
+        // Arrange
+        $organization = Organization::factory()->create();
+        $fromUser = User::factory()->create();
+        $toUser = User::factory()->create();
+        $fromUserMember = Member::factory()->forOrganization($organization)->forUser($fromUser)->create();
+        $toUserMember = Member::factory()->forOrganization($organization)->forUser($toUser)->create();
+        $runningTimeEntryOfFromMember = TimeEntry::factory()->forOrganization($organization)->forMember($fromUserMember)->active()->create();
+        TimeEntry::factory()->forOrganization($organization)->forMember($fromUserMember)->createMany(2);
+        $runningTimeEntryOfToMember = TimeEntry::factory()->forOrganization($organization)->forMember($toUserMember)->active()->create();
+
+        // Act
+        $this->memberService->assignOrganizationEntitiesToDifferentMember($organization, $fromUserMember, $toUserMember);
+
+        // Assert
+        $this->assertDatabaseMissing(TimeEntry::class, [
+            'id' => $runningTimeEntryOfFromMember->getKey(),
+        ]);
+        $this->assertSame(3, TimeEntry::query()->whereBelongsTo($toUserMember, 'member')->count());
+        $this->assertSame([$runningTimeEntryOfToMember->getKey()], TimeEntry::query()->whereBelongsTo($toUser, 'user')->whereNull('end')->pluck('id')->all());
+        $this->assertSame(0, TimeEntry::query()->whereBelongsTo($fromUserMember, 'member')->count());
+    }
+
     public function test_assign_organization_entities_to_different_member_moves_all_goals_of_the_member(): void
     {
         // Arrange