diff --git a/python/fusion_engine_client/applications/p1_capture.py b/python/fusion_engine_client/applications/p1_capture.py
index 6cc09abe..f9ff5c21 100755
--- a/python/fusion_engine_client/applications/p1_capture.py
+++ b/python/fusion_engine_client/applications/p1_capture.py
@@ -21,6 +21,7 @@
     serial_supported = False
     # Dummy stand-in if pySerial is not installed.
     class serial:
+        class Serial: pass
         class SerialException: pass
 
 if __package__ is None or __package__ == "":