diff --git a/octoprint/static/js/ui.js b/octoprint/static/js/ui.js
index 2ccb7be..0e632f4 100644
--- a/octoprint/static/js/ui.js
+++ b/octoprint/static/js/ui.js
@@ -1798,6 +1798,15 @@ $(function() {
 
         $("#terminal-send").click(function () {
             var command = $("#terminal-command").val();
+
+            /*
+            var re = /^([gm][0-9]+)(\s.*)?/;
+            var commandMatch = command.match(re);
+            if (commandMatch != null) {
+                command = commandMatch[1].toUpperCase() + ((commandMatch[2] !== undefined) ? commandMatch[2] : "");
+            }
+            */
+
             if (command) {
                 $.ajax({
                     url: AJAX_BASEURL + "control/command",
diff --git a/octoprint/util/comm.py b/octoprint/util/comm.py
index 4deb8bf..9ef8893 100644
--- a/octoprint/util/comm.py
+++ b/octoprint/util/comm.py
@@ -466,7 +466,6 @@ class MachineCom(object):
 		self.close()
 	
 	def _sendCommand(self, cmd):
-		cmd = cmd.upper()
 		if self._serial is None:
 			return
 		if 'M109' in cmd or 'M190' in cmd: