diff --git a/tests/integration/test_issues.py b/tests/integration/test_issues.py
index ddfe9efb..2311f893 100644
--- a/tests/integration/test_issues.py
+++ b/tests/integration/test_issues.py
@@ -464,13 +464,13 @@ def test_api_filters(client, filter_name, collection, expected, exclude_expected
         param = options[0].id
 
     # include test
-    url = f"{reverse('issues-list')}?project={project.id}&{filter_name}={param}"
+    url = "{}?project={}&{}={}".format(reverse('issues-list'), project.id, filter_name, param)
     response = client.get(url)
     assert response.status_code == 200
     assert len(response.data) == expected
 
     # exclude test
-    url = f"{reverse('issues-list')}?project={project.id}&exclude_{filter_name}={param}"
+    url = "{}?project={}&exclude_{}={}".format(reverse('issues-list'), project.id, filter_name, param)
     response = client.get(url)
     assert response.status_code == 200
     assert len(response.data) == exclude_expected
diff --git a/tests/integration/test_tasks.py b/tests/integration/test_tasks.py
index dd8ad407..3e24e004 100644
--- a/tests/integration/test_tasks.py
+++ b/tests/integration/test_tasks.py
@@ -871,13 +871,13 @@ def test_api_filters(client, filter_name, collection, expected, exclude_expected
         param = options[0].id
 
     # include test
-    url = f"{reverse('tasks-list')}?project={project.id}&{filter_name}={param}"
+    url = "{}?project={}&{}={}".format(reverse('tasks-list'), project.id, filter_name, param)
     response = client.get(url)
     assert response.status_code == 200
     assert len(response.data) == expected
 
     # exclude test
-    url = f"{reverse('tasks-list')}?project={project.id}&exclude_{filter_name}={param}"
+    url = "{}?project={}&exclude_{}={}".format(reverse('tasks-list'), project.id, filter_name, param)
     response = client.get(url)
     assert response.status_code == 200
     assert len(response.data) == exclude_expected
diff --git a/tests/integration/test_userstories.py b/tests/integration/test_userstories.py
index a97928ec..418c28c8 100644
--- a/tests/integration/test_userstories.py
+++ b/tests/integration/test_userstories.py
@@ -987,13 +987,13 @@ def test_api_filters(client, filter_name, collection, expected, exclude_expected
         param = options[0].id
 
     # include test
-    url = f"{reverse('userstories-list')}?project={project.id}&{filter_name}={param}"
+    url = "{}?project={}&{}={}".format(reverse('userstories-list'), project.id, filter_name, param)
     response = client.get(url)
     assert response.status_code == 200
     assert len(response.data) == expected
 
     # exclude test
-    url = f"{reverse('userstories-list')}?project={project.id}&exclude_{filter_name}={param}"
+    url = "{}?project={}&exclude_{}={}".format(reverse('userstories-list'), project.id, filter_name, param)
     response = client.get(url)
     assert response.status_code == 200
     assert len(response.data) == exclude_expected