removed leftover pdb import
diff --git a/tools/run_tests/sanity/check_bazel_workspace.py b/tools/run_tests/sanity/check_bazel_workspace.py
index ea670e4..673feb7 100755
--- a/tools/run_tests/sanity/check_bazel_workspace.py
+++ b/tools/run_tests/sanity/check_bazel_workspace.py
@@ -21,7 +21,6 @@
 import re
 import subprocess
 import sys
-import pdb
 
 os.chdir(os.path.join(os.path.dirname(sys.argv[0]), '../../..'))