diff --git a/src/ert/config/queue_config.py b/src/ert/config/queue_config.py
index f9c82f59e74..576e0f8934b 100644
--- a/src/ert/config/queue_config.py
+++ b/src/ert/config/queue_config.py
@@ -28,19 +28,10 @@
 
 
 def activate_script() -> str:
-    shell = os.environ.get("SHELL")
     venv = os.environ.get("VIRTUAL_ENV")
-    if not venv or not shell:
+    if not venv:
         return ""
-    script = [f"#!{shell}"]
-    match shell:
-        case x if "bash" in x or "zsh" in x:
-            script.append(f"source {venv}/bin/activate")
-        case x if "csh" in x or "tcsh" in x:
-            script.append(f"source {venv}/bin/activate.csh")
-        case x if "fish" in x:
-            script.append(f"source {venv}/bin/activate.fish")
-    return "\n".join(script)
+    return f"source {venv}/bin/activate"
 
 
 @pydantic.dataclasses.dataclass(config={"extra": "forbid", "validate_assignment": True})
diff --git a/src/ert/scheduler/driver.py b/src/ert/scheduler/driver.py
index 8a0b0a277a4..a5736dc597f 100644
--- a/src/ert/scheduler/driver.py
+++ b/src/ert/scheduler/driver.py
@@ -5,7 +5,6 @@
 import shlex
 from abc import ABC, abstractmethod
 from pathlib import Path
-from tempfile import NamedTemporaryFile
 from typing import Dict, Iterable, List, Optional, Tuple
 
 from .event import Event
@@ -17,19 +16,10 @@
 def create_submit_script(
     runpath: Path, executable: str, args: tuple[str, ...], activate_script: str
 ) -> str:
-    with NamedTemporaryFile(
-        dir=runpath,
-        prefix=".compute_activate",
-        suffix=".sh",
-        mode="w",
-        encoding="utf-8",
-        delete=False,
-    ) as script_handle:
-        script_handle.write(activate_script)
     return (
         "#!/usr/bin/env bash\n"
         f"cd {shlex.quote(str(runpath))}\n"
-        f"source {script_handle.name}\n"
+        f"{activate_script}\n"
         f"exec -a {shlex.quote(executable)} {executable} {shlex.join(args)}\n"
     )
 
diff --git a/tests/ert/unit_tests/config/test_queue_config.py b/tests/ert/unit_tests/config/test_queue_config.py
index 00b03a79ff6..bfa26641652 100644
--- a/tests/ert/unit_tests/config/test_queue_config.py
+++ b/tests/ert/unit_tests/config/test_queue_config.py
@@ -512,20 +512,13 @@ def test_driver_initialization_from_defaults(queue_system):
         SlurmDriver(**SlurmQueueOptions().driver_options)
 
 
-@pytest.mark.parametrize("venv", ["my_env", None])
 @pytest.mark.parametrize(
-    "shell, expected",
-    [
-        ["csh", "#!csh\nsource my_env/bin/activate.csh"],
-        ["bash", "#!bash\nsource my_env/bin/activate"],
-    ],
+    "venv, expected", [("my_env", "source my_env/bin/activate"), (None, "")]
 )
-def test_default_activate_script_generation(shell, expected, monkeypatch, venv):
-    monkeypatch.setenv("SHELL", shell)
+def test_default_activate_script_generation(expected, monkeypatch, venv):
     if venv:
-        monkeypatch.setenv("VIRTUAL_ENV", "my_env")
+        monkeypatch.setenv("VIRTUAL_ENV", venv)
     else:
         monkeypatch.delenv("VIRTUAL_ENV", raising=False)
-        expected = ""
     options = QueueOptions(name="local")
     assert options.activate_script == expected