diff --git a/examples/nips17_adversarial_competition/validation_tool/README.md b/examples/nips17_adversarial_competition/validation_tool/README.md
index 2801180c1..8d7ff4cc2 100644
--- a/examples/nips17_adversarial_competition/validation_tool/README.md
+++ b/examples/nips17_adversarial_competition/validation_tool/README.md
@@ -20,3 +20,8 @@ python validate_submission.py \
 
 After run this tool will print whether submission is valid or not.
 If submission is invalid then log messages will contain explanation why.
+
+NOTE: This tool might not work properly if file is located on NFS or if
+directory containing submission file can't be mounted in Docker using `-v`
+command line argument. In such case copy file to different location and try
+again.
diff --git a/examples/nips17_adversarial_competition/validation_tool/validate_submission_lib.py b/examples/nips17_adversarial_competition/validation_tool/validate_submission_lib.py
index e89f3599e..bec2e4fe2 100644
--- a/examples/nips17_adversarial_competition/validation_tool/validate_submission_lib.py
+++ b/examples/nips17_adversarial_competition/validation_tool/validate_submission_lib.py
@@ -381,6 +381,9 @@ def validate_submission(self, filename, submission_type):
       logging.error('Invalid submission type: %s', submission_type)
       return False
     self._prepare_temp_dir()
+    # Convert filename to be absolute path,
+    # relative path might cause problems when monting directory in Docker
+    filename = os.path.abspath(filename)
     # extract submission
     if not self._extract_submission(filename):
       return False