diff --git a/server/szurubooru/func/posts.py b/server/szurubooru/func/posts.py
index 406f6e18..25cd73a9 100644
--- a/server/szurubooru/func/posts.py
+++ b/server/szurubooru/func/posts.py
@@ -399,7 +399,9 @@ def _after_post_update(
 def _before_post_delete(
         _mapper: Any, _connection: Any, post: model.Post) -> None:
     if post.post_id:
-        image_hash.delete_image(post.post_id)
+        image_hash.delete_image(str(post.post_id))
+        files.delete(get_post_content_path(post))
+        files.delete(get_post_thumbnail_path(post))
 
 
 def _sync_post_content(post: model.Post) -> None:
@@ -686,12 +688,14 @@ def merge_posts(
     merge_favorites(source_post.post_id, target_post.post_id)
     merge_relations(source_post.post_id, target_post.post_id)
 
-    delete(source_post)
-
-    db.session.flush()
-
+    content = None
     if replace_content:
         content = files.get(get_post_content_path(source_post))
+
+    delete(source_post)
+    db.session.flush()
+
+    if content is not None:
         update_post_content(target_post, content)
 
 
diff --git a/server/szurubooru/tests/api/test_post_deleting.py b/server/szurubooru/tests/api/test_post_deleting.py
index e35a4488..85744ad1 100644
--- a/server/szurubooru/tests/api/test_post_deleting.py
+++ b/server/szurubooru/tests/api/test_post_deleting.py
@@ -1,12 +1,14 @@
 from unittest.mock import patch
+
 import pytest
+
 from szurubooru import api, db, model, errors
-from szurubooru.func import posts, tags, snapshots
+from szurubooru.func import posts, snapshots
 
 
 @pytest.fixture(autouse=True)
 def inject_config(config_injector):
-    config_injector({'privileges': {'posts:delete': model.User.RANK_REGULAR}})
+    config_injector({'secret': 'secret', 'data_dir': '', 'privileges': {'posts:delete': model.User.RANK_REGULAR}})
 
 
 def test_deleting(user_factory, post_factory, context_factory):
diff --git a/server/szurubooru/tests/func/test_posts.py b/server/szurubooru/tests/func/test_posts.py
index e296ec0a..c5570f0e 100644
--- a/server/szurubooru/tests/func/test_posts.py
+++ b/server/szurubooru/tests/func/test_posts.py
@@ -1,7 +1,9 @@
-import os
-from unittest.mock import patch
 from datetime import datetime
+from unittest.mock import patch
+
+import os
 import pytest
+
 from szurubooru import db, model
 from szurubooru.func import (
     posts, users, comments, tags, images, files, util, image_hash)
@@ -936,6 +938,6 @@ def test_merge_posts_replaces_content(
     assert posts.try_get_post_by_id(source_post.post_id) is None
     post = posts.get_post_by_id(target_post.post_id)
     assert post is not None
-    assert os.path.exists(source_path)
+    assert not os.path.exists(source_path)
     assert os.path.exists(target_path1)
     assert not os.path.exists(target_path2)
diff --git a/server/szurubooru/tests/model/test_post.py b/server/szurubooru/tests/model/test_post.py
index f35e2751..2fffd87b 100644
--- a/server/szurubooru/tests/model/test_post.py
+++ b/server/szurubooru/tests/model/test_post.py
@@ -1,7 +1,15 @@
 from datetime import datetime
+
+import pytest
+
 from szurubooru import db, model
 
 
+@pytest.fixture(autouse=True)
+def inject_config(config_injector):
+    config_injector({'secret': 'secret', 'data_dir': ''})
+
+
 def test_saving_post(post_factory, user_factory, tag_factory):
     user = user_factory()
     tag1 = tag_factory()
diff --git a/server/szurubooru/tests/model/test_tag.py b/server/szurubooru/tests/model/test_tag.py
index 07bbc0e5..9121f91c 100644
--- a/server/szurubooru/tests/model/test_tag.py
+++ b/server/szurubooru/tests/model/test_tag.py
@@ -1,7 +1,15 @@
 from datetime import datetime
+
+import pytest
+
 from szurubooru import db, model
 
 
+@pytest.fixture(autouse=True)
+def inject_config(config_injector):
+    config_injector({'secret': 'secret', 'data_dir': ''})
+
+
 def test_saving_tag(tag_factory):
     sug1 = tag_factory(names=['sug1'])
     sug2 = tag_factory(names=['sug2'])