diff --git a/server/szurubooru/func/tags.py b/server/szurubooru/func/tags.py
index dc145f3..3fbf26c 100644
--- a/server/szurubooru/func/tags.py
+++ b/server/szurubooru/func/tags.py
@@ -138,13 +138,13 @@ def get_tag_siblings(tag):
     pt_alias1 = sqlalchemy.orm.aliased(db.PostTag)
     pt_alias2 = sqlalchemy.orm.aliased(db.PostTag)
     result = db.session \
-        .query(tag_alias, sqlalchemy.func.count(tag_alias.tag_id)) \
+        .query(tag_alias, sqlalchemy.func.count(pt_alias2.post_id)) \
         .join(pt_alias1, pt_alias1.tag_id == tag_alias.tag_id) \
         .join(pt_alias2, pt_alias2.post_id == pt_alias1.post_id) \
         .filter(pt_alias2.tag_id == tag.tag_id) \
         .filter(pt_alias1.tag_id != tag.tag_id) \
         .group_by(tag_alias.tag_id) \
-        .order_by(tag_alias.post_count.desc()) \
+        .order_by(sqlalchemy.func.count(pt_alias2.post_id).desc()) \
         .limit(50)
     return result
 
diff --git a/server/szurubooru/tests/api/test_tag_siblings_retrieving.py b/server/szurubooru/tests/api/test_tag_siblings_retrieving.py
index 37ac7de..cddb04a 100644
--- a/server/szurubooru/tests/api/test_tag_siblings_retrieving.py
+++ b/server/szurubooru/tests/api/test_tag_siblings_retrieving.py
@@ -4,11 +4,11 @@ from szurubooru import api, db, errors
 from szurubooru.func import util, tags
 
 def assert_results(result, expected_tag_names_and_occurrences):
-    actual_tag_names_and_occurences = {}
+    actual_tag_names_and_occurences = []
     for item in result['results']:
         tag_name = item['tag']['names'][0]
         occurrences = item['occurrences']
-        actual_tag_names_and_occurences[tag_name] = occurrences
+        actual_tag_names_and_occurences.append((tag_name, occurrences))
     assert actual_tag_names_and_occurences == expected_tag_names_and_occurrences
 
 @pytest.fixture
@@ -33,7 +33,7 @@ def test_unused(test_ctx):
     result = test_ctx.api.get(
         test_ctx.context_factory(
             user=test_ctx.user_factory(rank=db.User.RANK_REGULAR)), 'tag')
-    assert_results(result, {})
+    assert_results(result, [])
 
 def test_used_alone(test_ctx):
     tag = test_ctx.tag_factory(names=['tag'])
@@ -43,7 +43,7 @@ def test_used_alone(test_ctx):
     result = test_ctx.api.get(
         test_ctx.context_factory(
             user=test_ctx.user_factory(rank=db.User.RANK_REGULAR)), 'tag')
-    assert_results(result, {})
+    assert_results(result, [])
 
 def test_used_with_others(test_ctx):
     tag1 = test_ctx.tag_factory(names=['tag1'])
@@ -54,11 +54,11 @@ def test_used_with_others(test_ctx):
     result = test_ctx.api.get(
         test_ctx.context_factory(
             user=test_ctx.user_factory(rank=db.User.RANK_REGULAR)), 'tag1')
-    assert_results(result, {'tag2': 1})
+    assert_results(result, [('tag2', 1)])
     result = test_ctx.api.get(
         test_ctx.context_factory(
             user=test_ctx.user_factory(rank=db.User.RANK_REGULAR)), 'tag2')
-    assert_results(result, {'tag1': 1})
+    assert_results(result, [('tag1', 1)])
 
 def test_used_with_multiple_others(test_ctx):
     tag1 = test_ctx.tag_factory(names=['tag1'])
@@ -66,21 +66,26 @@ def test_used_with_multiple_others(test_ctx):
     tag3 = test_ctx.tag_factory(names=['tag3'])
     post1 = test_ctx.post_factory()
     post2 = test_ctx.post_factory()
+    post3 = test_ctx.post_factory()
+    post4 = test_ctx.post_factory()
     post1.tags = [tag1, tag2, tag3]
     post2.tags = [tag1, tag3]
-    db.session.add_all([post1, post2, tag1, tag2, tag3])
+    post3.tags = [tag2]
+    post4.tags = [tag2]
+    db.session.add_all([post1, post2, post3, post4, tag1, tag2, tag3])
     result = test_ctx.api.get(
         test_ctx.context_factory(
             user=test_ctx.user_factory(rank=db.User.RANK_REGULAR)), 'tag1')
-    assert_results(result, {'tag2': 1, 'tag3': 2})
+    assert_results(result, [('tag3', 2), ('tag2', 1)])
     result = test_ctx.api.get(
         test_ctx.context_factory(
             user=test_ctx.user_factory(rank=db.User.RANK_REGULAR)), 'tag2')
-    assert_results(result, {'tag1': 1, 'tag3': 1})
+    assert_results(result, [('tag1', 1), ('tag3', 1)])
     result = test_ctx.api.get(
         test_ctx.context_factory(
             user=test_ctx.user_factory(rank=db.User.RANK_REGULAR)), 'tag3')
-    assert_results(result, {'tag1': 2, 'tag2': 1})
+    # even though tag2 is used more widely, tag1 is more relevant to tag3
+    assert_results(result, [('tag1', 2), ('tag2', 1)])
 
 def test_trying_to_retrieve_non_existing(test_ctx):
     with pytest.raises(tags.TagNotFoundError):