diff --git a/src/octoprint/util/comm_acc.py b/src/octoprint/util/comm_acc.py
index 00a3654c..6431fe88 100644
--- a/src/octoprint/util/comm_acc.py
+++ b/src/octoprint/util/comm_acc.py
@@ -528,9 +528,11 @@ class MachineCom(object):
 			#self.sendCommand("$H") # homing here results in invalid GCode ID33 on G02/03 commands. WTF?
 			#self.sendCommand("G92X0Y0Z0")
 			#self.sendCommand("G90")
-			#self.sendCommand("M08")
 			#self.sendCommand("G21")
 			
+			# ensure fan is on whatever gcode follows.
+			self.sendCommand("M08")
+			
 			self._currentFile.start()
 
 			self._changeState(self.STATE_PRINTING)