diff --git a/python-package/xgboost/sklearn.py b/python-package/xgboost/sklearn.py
index 82fbb3eefeb8..257cba0f942c 100644
--- a/python-package/xgboost/sklearn.py
+++ b/python-package/xgboost/sklearn.py
@@ -295,7 +295,7 @@ def validate_or_none(meta: Optional[List], name: str) -> List:
             return [None] * n_validation
         if len(meta) != n_validation:
             raise ValueError(
-                f"{name}'s length does not eqaul to `eval_set`, " +
+                f"{name}'s length does not equal `eval_set`'s length, " +
                 f"expecting {n_validation}, got {len(meta)}"
             )
         return meta