diff --git a/src/octoprint/static/js/app/viewmodels/printerstate.js b/src/octoprint/static/js/app/viewmodels/printerstate.js
index 00a7b67e..048578e1 100644
--- a/src/octoprint/static/js/app/viewmodels/printerstate.js
+++ b/src/octoprint/static/js/app/viewmodels/printerstate.js
@@ -14,6 +14,16 @@ $(function() {
         self.isLoading = ko.observable(undefined);
         self.isSdReady = ko.observable(undefined);
 
+        self.enablePrint = ko.computed(function() {
+            return self.isOperational() && self.isReady() && !self.isPrinting() && self.loginState.isUser() && self.filename() != undefined;
+        });
+        self.enablePause = ko.computed(function() {
+            return self.isOperational() && (self.isPrinting() || self.isPaused()) && self.loginState.isUser();
+        });
+        self.enableCancel = ko.computed(function() {
+            return self.isOperational() && (self.isPrinting() || self.isPaused()) && self.loginState.isUser();
+        });
+
         self.filename = ko.observable(undefined);
         self.progress = ko.observable(undefined);
         self.filesize = ko.observable(undefined);
@@ -242,4 +252,4 @@ $(function() {
         ["loginStateViewModel"],
         ["#state_wrapper", "#drop_overlay"]
     ]);
-});
\ No newline at end of file
+});
diff --git a/src/octoprint/templates/sidebar/state.jinja2 b/src/octoprint/templates/sidebar/state.jinja2
index 7bcfdd25..972a2605 100644
--- a/src/octoprint/templates/sidebar/state.jinja2
+++ b/src/octoprint/templates/sidebar/state.jinja2
@@ -14,7 +14,7 @@
 </div>
 
 <div class="row-fluid print-control" style="display: none;" data-bind="visible: loginState.isUser">
-    <button class="btn btn-primary span4" data-bind="click: print, enable: isOperational() && isReady() && !isPrinting() && loginState.isUser(), css: {'btn-danger': isPaused()}, attr: {title: titlePrintButton}" id="job_print"><i class="icon-white" data-bind="css: {'icon-print': !isPaused(), 'icon-undo': isPaused()}"></i> <span data-bind="text: (isPaused() ? '{{ _('Restart') }}' : '{{ _('Print') }}')">{{ _('Print') }}</span></button>
-    <button class="btn span4" id="job_pause" data-bind="click: pause, enable: isOperational() && (isPrinting() || isPaused()) && loginState.isUser(), css: {active: isPaused()}, attr: {title: titlePauseButton}"><i data-bind="css: {'icon-pause': !isPaused(), 'icon-play': isPaused()}"></i> <span data-bind="visible: !isPaused()">{{ _('Pause') }}</span><span data-bind="visible: isPaused()">{{ _('Resume') }}</span></button>
-    <button class="btn span4" id="job_cancel" data-bind="click: cancel, enable: isOperational() && (isPrinting() || isPaused()) && loginState.isUser()" title="{{ _('Cancels the print job') }}"><i class="icon-stop"></i> {{ _('Cancel') }}</button>
+    <button class="btn btn-primary span4" data-bind="click: print, enable: enablePrint, css: {'btn-danger': isPaused()}, attr: {title: titlePrintButton}" id="job_print"><i class="icon-white" data-bind="css: {'icon-print': !isPaused(), 'icon-undo': isPaused()}"></i> <span data-bind="text: (isPaused() ? '{{ _('Restart') }}' : '{{ _('Print') }}')">{{ _('Print') }}</span></button>
+    <button class="btn span4" id="job_pause" data-bind="click: pause, enable: enablePause, css: {active: isPaused()}, attr: {title: titlePauseButton}"><i data-bind="css: {'icon-pause': !isPaused(), 'icon-play': isPaused()}"></i> <span data-bind="visible: !isPaused()">{{ _('Pause') }}</span><span data-bind="visible: isPaused()">{{ _('Resume') }}</span></button>
+    <button class="btn span4" id="job_cancel" data-bind="click: cancel, enable: enableCancel" title="{{ _('Cancels the print job') }}"><i class="icon-stop"></i> {{ _('Cancel') }}</button>
 </div>