diff --git a/llvm_tools/llvm_bisection.py b/llvm_tools/llvm_bisection.py
index c8d694c..b1898ea 100755
--- a/llvm_tools/llvm_bisection.py
+++ b/llvm_tools/llvm_bisection.py
@@ -357,13 +357,14 @@
       print(skip_revisions_message)
 
     if args_output.cleanup:
-      # Abondon all the CLs created for bisection
+      # Abandon all the CLs created for bisection
       gerrit = os.path.join(args_output.chroot_path, 'chromite/bin/gerrit')
       for build in bisect_state['jobs']:
         try:
-          subprocess.check_output([gerrit, 'abandon', build['cl']],
-                                  stderr=subprocess.STDOUT,
-                                  encoding='utf-8')
+          subprocess.check_output(
+              [gerrit, 'abandon', str(build['cl'])],
+              stderr=subprocess.STDOUT,
+              encoding='utf-8')
         except subprocess.CalledProcessError as err:
           # the CL may have been abandoned
           if 'chromite.lib.gob_util.GOBError' not in err.output:
diff --git a/llvm_tools/llvm_bisection_unittest.py b/llvm_tools/llvm_bisection_unittest.py
index a40770a..cc22dfa 100755
--- a/llvm_tools/llvm_bisection_unittest.py
+++ b/llvm_tools/llvm_bisection_unittest.py
@@ -301,7 +301,7 @@
             [
                 os.path.join(args_output.chroot_path, 'chromite/bin/gerrit'),
                 'abandon',
-                cl,
+                str(cl),
             ],
             stderr=subprocess.STDOUT,
             encoding='utf-8',