diff --git a/src/Mod/Arch/ArchCommands.py b/src/Mod/Arch/ArchCommands.py
index 71387ac6f1..24d3d72ac6 100644
--- a/src/Mod/Arch/ArchCommands.py
+++ b/src/Mod/Arch/ArchCommands.py
@@ -1276,12 +1276,16 @@ def getExtrusionData(shape,sortmethod="area"):
 def printMessage( message ):
     FreeCAD.Console.PrintMessage( message )
     if FreeCAD.GuiUp :
-        reply = QtGui.QMessageBox.information( None , "" , message.decode('utf8') )
+        if sys.version_info.major < 3:
+            message = message.decode("utf8")
+        reply = QtGui.QMessageBox.information( None , "" , message )
 
 def printWarning( message ):
     FreeCAD.Console.PrintMessage( message )
     if FreeCAD.GuiUp :
-        reply = QtGui.QMessageBox.warning( None , "" , message.decode('utf8') )
+        if sys.version_info.major < 3:
+            message = message.decode("utf8")
+        reply = QtGui.QMessageBox.warning( None , "" , message )
 
 
 # command definitions ###############################################