diff --git a/fastNLP/core/metrics/accuracy.py b/fastNLP/core/metrics/accuracy.py
index c8928086..47d5e114 100644
--- a/fastNLP/core/metrics/accuracy.py
+++ b/fastNLP/core/metrics/accuracy.py
@@ -64,7 +64,7 @@ class Accuracy(Metric):
             if np.prod(pred.shape) != np.prod(target.shape):
                 raise RuntimeError(f"when pred have same dimensions with target, they should have same element numbers."
                                    f" while target have shape:{target.shape}, "
-                                   f"pred have shape: {target.shape}")
+                                   f"pred have shape: {pred.shape}")
 
         elif pred.ndim == target.ndim + 1:
             pred = pred.argmax(axis=-1)