diff --git a/onnxruntime/python/tools/transformers/optimizer.py b/onnxruntime/python/tools/transformers/optimizer.py
index 0e94eafaf3..57c2fc380a 100644
--- a/onnxruntime/python/tools/transformers/optimizer.py
+++ b/onnxruntime/python/tools/transformers/optimizer.py
@@ -74,7 +74,7 @@ def optimize_by_onnxruntime(
 
     import onnxruntime
 
-    if use_gpu and not set(onnxruntime.get_available_providers()).isdisjoint(
+    if use_gpu and set(onnxruntime.get_available_providers()).isdisjoint(
         ["CUDAExecutionProvider", "ROCMExecutionProvider", "MIGraphXExecutionProvider"]
     ):
         logger.error("There is no gpu for onnxruntime to do optimization.")
@@ -112,7 +112,7 @@ def optimize_by_onnxruntime(
             gpu_ep.append("ROCMExecutionProvider")
 
         session = onnxruntime.InferenceSession(onnx_model_path, sess_options, providers=gpu_ep, **kwargs)
-        assert set(onnxruntime.get_available_providers()).isdisjoint(
+        assert not set(onnxruntime.get_available_providers()).isdisjoint(
             ["CUDAExecutionProvider", "ROCMExecutionProvider", "MIGraphXExecutionProvider"]
         )