diff --git a/asyncer/_compat.py b/asyncer/_compat.py
index 5e390e6e..3ee39fdf 100644
--- a/asyncer/_compat.py
+++ b/asyncer/_compat.py
@@ -1,6 +1,5 @@
 # AnyIO 4.1.0 renamed cancellable to abandon_on_cancel
-import importlib
-import importlib.metadata
+import inspect
 from collections.abc import Callable
 from typing import TypeVar
 
@@ -9,12 +8,15 @@
 from anyio import CapacityLimiter
 from typing_extensions import TypeVarTuple, Unpack
 
-ANYIO_VERSION = importlib.metadata.version("anyio")
-
 T_Retval = TypeVar("T_Retval")
 PosArgsT = TypeVarTuple("PosArgsT")
 
-if ANYIO_VERSION >= "4.1.0":
+# Use abandon_on_cancel if available
+RUN_SYNC_AOC = (
+    "abandon_on_cancel" in inspect.getfullargspec(anyio.to_thread.run_sync).kwonlyargs
+)
+
+if RUN_SYNC_AOC:
 
     async def run_sync(
         func: Callable[[Unpack[PosArgsT]], T_Retval],