diff --git a/tools/testing/selftests/tpm2/tpm2.py b/tools/testing/selftests/tpm2/tpm2.py
index 057a4f49c79d..c7363c6764fc 100644
--- a/tools/testing/selftests/tpm2/tpm2.py
+++ b/tools/testing/selftests/tpm2/tpm2.py
@@ -371,6 +371,10 @@ class Client:
             fcntl.fcntl(self.tpm, fcntl.F_SETFL, flags)
             self.tpm_poll = select.poll()
 
+    def __del__(self):
+        if self.tpm:
+            self.tpm.close()
+
     def close(self):
         self.tpm.close()