diff --git a/a_sync/a_sync/modifiers/semaphores.py b/a_sync/a_sync/modifiers/semaphores.py
index 59c31d64..8a781c94 100644
--- a/a_sync/a_sync/modifiers/semaphores.py
+++ b/a_sync/a_sync/modifiers/semaphores.py
@@ -6,9 +6,6 @@
 from a_sync import exceptions, primitives
 from a_sync._typing import *
 
-# We keep this here for now so we don't break downstream deps. Eventually will be removed.
-from a_sync.primitives import ThreadsafeSemaphore, DummySemaphore
-
 
 @overload
 def apply_semaphore(  # type: ignore [misc]
@@ -134,7 +131,7 @@ def apply_semaphore(
         `primitives.Semaphore` is a subclass of `asyncio.Semaphore`. Therefore, when the documentation refers to `asyncio.Semaphore`, it also includes `primitives.Semaphore` and any other subclasses.
     """
     # Parse Inputs
-    if isinstance(coro_fn, (int, asyncio.Semaphore)):
+    if isinstance(coro_fn, (int, asyncio.Semaphore, primitives.Semaphore)):
         if semaphore is not None:
             raise ValueError("You can only pass in one arg.")
         semaphore = coro_fn
@@ -146,7 +143,7 @@ def apply_semaphore(
     # Create the semaphore if necessary
     if isinstance(semaphore, int):
         semaphore = primitives.ThreadsafeSemaphore(semaphore)
-    elif not isinstance(semaphore, asyncio.Semaphore):
+    elif not isinstance(semaphore, (asyncio.Semaphore, primitives.Semaphore)):
         raise TypeError(
             f"'semaphore' must either be an integer or a Semaphore object. You passed {semaphore}"
         )
diff --git a/tests/a_sync/modifiers/test_apply_semaphore.py b/tests/a_sync/modifiers/test_apply_semaphore.py
new file mode 100644
index 00000000..7c53271d
--- /dev/null
+++ b/tests/a_sync/modifiers/test_apply_semaphore.py
@@ -0,0 +1,42 @@
+import asyncio
+import pytest
+
+from a_sync import Semaphore, apply_semaphore
+from a_sync.exceptions import FunctionNotAsync
+
+
+@pytest.mark.asyncio_cooperative
+async def test_apply_semaphore_int():
+    apply_semaphore(asyncio.sleep, 1)
+
+
+@pytest.mark.asyncio_cooperative
+async def test_apply_semaphore_asyncio_semaphore():
+    apply_semaphore(asyncio.sleep, asyncio.Semaphore(1))
+
+
+@pytest.mark.asyncio_cooperative
+async def test_apply_semaphore_a_sync_semaphore():
+    apply_semaphore(asyncio.sleep, Semaphore(1))
+
+
+def fail():
+    pass
+
+
+@pytest.mark.asyncio_cooperative
+async def test_apply_semaphore_failure_int():
+    with pytest.raises(FunctionNotAsync):
+        apply_semaphore(fail, 1)
+
+
+@pytest.mark.asyncio_cooperative
+async def test_apply_semaphore_failure_asyncio_semaphore():
+    with pytest.raises(FunctionNotAsync):
+        apply_semaphore(fail, asyncio.Semaphore(1))
+
+
+@pytest.mark.asyncio_cooperative
+async def test_apply_semaphore_failure_a_sync_semaphore():
+    with pytest.raises(FunctionNotAsync):
+        apply_semaphore(fail, Semaphore(1))