diff --git a/tests/test_cmd_tasks.py b/tests/test_cmd_tasks.py
index d5c9c91ba..02c066217 100644
--- a/tests/test_cmd_tasks.py
+++ b/tests/test_cmd_tasks.py
@@ -51,7 +51,7 @@ def test_cmd_alias_env_var(run_poe_subproc):
     assert result.stderr == ""
 
 
-def test_cmd_task_with_multiple_value_arg(run_poe_subproc, is_windows):
+def test_cmd_task_with_multiple_value_arg(run_poe_subproc):
     result = run_poe_subproc("multiple-value-arg", "hey", "1", "2", "3", project="cmds")
     assert result.capture == "Poe => poe_test_echo first: hey second: 1 2 3\n"
     assert result.stdout == "first: hey second: 1 2 3\n"
diff --git a/tests/test_envfile.py b/tests/test_envfile.py
index 0f52f2efa..e3f72face 100644
--- a/tests/test_envfile.py
+++ b/tests/test_envfile.py
@@ -3,7 +3,7 @@
 from pathlib import Path
 
 
-def test_global_envfile_and_default(run_poe_subproc, is_windows):
+def test_global_envfile_and_default(run_poe_subproc):
     result = run_poe_subproc("deploy-dev", project="envfile")
     assert (
         "Poe => poe_test_echo deploying to admin:12345@dev.example.com:8080\n"
@@ -13,7 +13,7 @@ def test_global_envfile_and_default(run_poe_subproc, is_windows):
     assert result.stderr == ""
 
 
-def test_task_envfile_and_default(run_poe_subproc, is_windows):
+def test_task_envfile_and_default(run_poe_subproc):
     result = run_poe_subproc("deploy-prod", project="envfile")
     assert (
         "Poe => poe_test_echo deploying to admin:12345@prod.example.com/app\n"
@@ -23,7 +23,7 @@ def test_task_envfile_and_default(run_poe_subproc, is_windows):
     assert result.stderr == ""
 
 
-def test_multiple_envfiles(run_poe_subproc, projects, is_windows):
+def test_multiple_envfiles(run_poe_subproc, projects):
     result = run_poe_subproc(
         f'--root={projects["envfile/multiple_envfiles"]}', "show_me_the_vals"
     )
diff --git a/tests/test_poe_config.py b/tests/test_poe_config.py
index bd52c9b72..96b54fb80 100644
--- a/tests/test_poe_config.py
+++ b/tests/test_poe_config.py
@@ -33,7 +33,7 @@ def test_setting_default_array_item_task_type(run_poe_subproc):
     assert result.stderr == ""
 
 
-def test_setting_global_env_vars(run_poe_subproc, is_windows):
+def test_setting_global_env_vars(run_poe_subproc):
     result = run_poe_subproc("travel", env=no_venv)
     assert result.capture == f"Poe => poe_test_echo from EARTH to\nPoe => travel[1]\n"
     assert result.stdout == f"from EARTH to\nMARS\n"
@@ -73,7 +73,7 @@ def test_partially_decrease_verbosity(run_poe_subproc, high_verbosity_project_pa
     assert result.stderr == ""
 
 
-def test_decrease_verbosity(run_poe_subproc, is_windows):
+def test_decrease_verbosity(run_poe_subproc):
     result = run_poe_subproc(
         "-q",
         "part1",
diff --git a/tests/test_poetry_plugin.py b/tests/test_poetry_plugin.py
index 2bf5c1dba..eb20b61a8 100644
--- a/tests/test_poetry_plugin.py
+++ b/tests/test_poetry_plugin.py
@@ -50,9 +50,7 @@ def test_task_with_cli_dependency(
 
 
 @pytest.mark.slow
-def test_task_with_lib_dependency(
-    run_poetry, projects, setup_poetry_project, is_windows
-):
+def test_task_with_lib_dependency(run_poetry, projects, setup_poetry_project):
     result = run_poetry(["poe", "cow-cheese"], cwd=projects["poetry_plugin"])
     assert result.stdout == (
         "Poe => from cowpy import cow; print(list(cow.COWACTERS)[5])\ncheese\n"
diff --git a/tests/test_sequence_tasks.py b/tests/test_sequence_tasks.py
index 7a324ac66..e76c6601d 100644
--- a/tests/test_sequence_tasks.py
+++ b/tests/test_sequence_tasks.py
@@ -1,4 +1,4 @@
-def test_sequence_task(run_poe_subproc, esc_prefix, is_windows):
+def test_sequence_task(run_poe_subproc, esc_prefix):
     result = run_poe_subproc("composite_task", project="sequences")
     assert (
         result.capture
@@ -8,7 +8,7 @@ def test_sequence_task(run_poe_subproc, esc_prefix, is_windows):
     assert result.stderr == ""
 
 
-def test_another_sequence_task(run_poe_subproc, esc_prefix, is_windows):
+def test_another_sequence_task(run_poe_subproc, esc_prefix):
     # This should be exactly the same as calling the composite_task task directly
     result = run_poe_subproc("also_composite_task", project="sequences")
     assert (
diff --git a/tests/test_shell_task.py b/tests/test_shell_task.py
index 443f613c3..9b80e5732 100644
--- a/tests/test_shell_task.py
+++ b/tests/test_shell_task.py
@@ -65,7 +65,7 @@ def test_interpreter_bash(run_poe_subproc):
 
 
 @pytest.mark.skipif(not shutil.which("pwsh"), reason="No pwsh available")
-def test_interpreter_pwsh(run_poe_subproc, is_windows):
+def test_interpreter_pwsh(run_poe_subproc):
     result = run_poe_subproc("echo_pwsh", project="shells")
     assert result.capture == (f"Poe => poe_test_echo $ENV:test_var\n")
     assert "roflcopter" in result.stdout
@@ -73,7 +73,7 @@ def test_interpreter_pwsh(run_poe_subproc, is_windows):
 
 
 @pytest.mark.skipif(not shutil.which("powershell"), reason="No powershell available")
-def test_interpreter_pwsh(run_poe_subproc, is_windows):
+def test_interpreter_pwsh(run_poe_subproc):
     result = run_poe_subproc("echo_powershell", project="shells")
     assert result.capture == (f"Poe => poe_test_echo $ENV:test_var\n")
     assert "roflcopter" in result.stdout