diff --git a/keras/src/ops/operation_utils.py b/keras/src/ops/operation_utils.py
index b1ac2621de0a..dcd326e625b0 100644
--- a/keras/src/ops/operation_utils.py
+++ b/keras/src/ops/operation_utils.py
@@ -116,7 +116,6 @@ def compute_pooling_output_shape(
     """
     strides = pool_size if strides is None else strides
     input_shape_origin = list(input_shape)
-    input_shape = np.array(input_shape)
     if data_format == "channels_last":
         spatial_shape = input_shape[1:-1]
     else:
@@ -129,6 +128,8 @@ def compute_pooling_output_shape(
             spatial_shape[i] = -1
             none_dims.append(i)
     pool_size = np.array(pool_size)
+    spatial_shape = np.array(spatial_shape)
+    strides = np.array(strides)
     if padding == "valid":
         output_spatial_shape = (
             np.floor((spatial_shape - pool_size) / strides) + 1