diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index ff25526f20..879d04c760 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -7,6 +7,7 @@ CHANGELOG
 
 * bug-fix: Remove __all__ and add noqa in __init__
 * bug-fix: Estimators: Change max_iterations hyperparameter key for KMeans
+* bug-fix: Estimators: Remove unused argument job_details for ``EstimatorBase.attach()``
 
 1.3.0
 =====
diff --git a/src/sagemaker/estimator.py b/src/sagemaker/estimator.py
index 5beded395b..bd6d3a334e 100644
--- a/src/sagemaker/estimator.py
+++ b/src/sagemaker/estimator.py
@@ -183,7 +183,7 @@ def _from_training_job(cls, init_params, hyperparameters, image, sagemaker_sessi
         raise NotImplementedError()
 
     @classmethod
-    def attach(cls, training_job_name, sagemaker_session=None, job_details=None):
+    def attach(cls, training_job_name, sagemaker_session=None):
         """Attach to an existing training job.
 
         Create an Estimator bound to an existing training job, each subclass is responsible to implement