diff --git a/python-package/xgboost/core.py b/python-package/xgboost/core.py
index 227f0bdeea43..18090a3acc87 100644
--- a/python-package/xgboost/core.py
+++ b/python-package/xgboost/core.py
@@ -1907,7 +1907,7 @@ def inplace_predict(
             if len(data.shape) != 1 and self.num_features() != data.shape[1]:
                 raise ValueError(
                     f"Feature shape mismatch, expected: {self.num_features()}, "
-                    f"got {data.shape[0]}"
+                    f"got {data.shape[1]}"
                 )
 
         if isinstance(data, np.ndarray):