diff --git a/octoprint/printer.py b/octoprint/printer.py
index 5b4f3c8..3f64d56 100644
--- a/octoprint/printer.py
+++ b/octoprint/printer.py
@@ -177,6 +177,7 @@ class Printer():
 		if (self._comm is not None and self._comm.isPrinting()) or (self._gcodeLoader is not None):
 			return
 
+		self._sdFile = None
 		self._setJobData(None, None)
 
 		onGcodeLoadedCallback = self._onGcodeLoaded
diff --git a/octoprint/util/comm.py b/octoprint/util/comm.py
index 01c77f7..207eb74 100644
--- a/octoprint/util/comm.py
+++ b/octoprint/util/comm.py
@@ -781,6 +781,8 @@ class MachineCom(object):
 	def printGCode(self, gcodeList):
 		if not self.isOperational() or self.isPrinting():
 			return
+		if self._sdPrinting:
+			self._sdPrinting = False
 		self._gcodeList = gcodeList
 		self._gcodePos = 0
 		self._printSection = 'CUSTOM'
@@ -814,6 +816,7 @@ class MachineCom(object):
 		if self.isOperational():
 			self._changeState(self.STATE_OPERATIONAL)
 		if self._sdPrinting:
+			self._sdPrinting = False
 			self.sendCommand("M25")    # pause print
 			self.sendCommand("M26 S0") # reset position in file to byte 0
 	
@@ -838,12 +841,6 @@ class MachineCom(object):
 		result.update(self._feedRateModifier)
 		return result
 
-	def enableSdPrinting(self, enable):
-		if self.isPrinting():
-			return
-
-		self._sdPrinting = enable
-
 	def getSdFiles(self):
 		return self._sdFiles