diff --git a/cwltool/job.py b/cwltool/job.py
index 10280f9a7..817cb04c0 100644
--- a/cwltool/job.py
+++ b/cwltool/job.py
@@ -913,7 +913,7 @@ def docker_monitor(
             self.name,
             int((max_mem_percent / 100 * max_mem) / (2**20)),
         )
-        if cleanup_cidfile:
+        if cleanup_cidfile and os.path.exists(cidfile):
             os.remove(cidfile)