diff --git a/devlib/collector/serial_trace.py b/devlib/collector/serial_trace.py
index 7743956..4abceb9 100644
--- a/devlib/collector/serial_trace.py
+++ b/devlib/collector/serial_trace.py
@@ -33,7 +33,7 @@ class SerialTraceCollector(CollectorBase):
         self.serial_port = serial_port
         self.baudrate = baudrate
         self.timeout = timeout
-        self.output_path - None
+        self.output_path = None
 
         self._serial_target = None
         self._conn = None