diff --git a/pytensor/link/numba/dispatch/basic.py b/pytensor/link/numba/dispatch/basic.py
index 7fe609dce2..b4fae97c09 100644
--- a/pytensor/link/numba/dispatch/basic.py
+++ b/pytensor/link/numba/dispatch/basic.py
@@ -59,7 +59,6 @@ def global_numba_func(func):
 
 
 def numba_njit(*args, **kwargs):
-    kwargs = kwargs.copy()
     kwargs.setdefault("cache", config.numba__cache)
 
     if len(args) > 0 and callable(args[0]):