diff --git a/loopy/target/pyopencl.py b/loopy/target/pyopencl.py
index 73e8e00929ddc04386200d7d450b91d66439eab6..34faf0a03d60b5be391c7f49e9baf247093e965a 100644
--- a/loopy/target/pyopencl.py
+++ b/loopy/target/pyopencl.py
@@ -125,7 +125,8 @@ def adjust_local_temp_var_storage(kernel, device):
 
             new_storage_shape = storage_shape
 
-        new_temp_vars[temp_var.name] = temp_var.copy(storage_shape=new_storage_shape)
+        new_temp_vars[temp_var.name] = temp_var.copy(
+                storage_shape=tuple(new_storage_shape))
 
     return kernel.copy(temporary_variables=new_temp_vars)