diff --git a/nikola/data/themes/bootstrap3/templates/base.tmpl b/nikola/data/themes/bootstrap3/templates/base.tmpl
index 01fb784832..6cb5bf4210 100644
--- a/nikola/data/themes/bootstrap3/templates/base.tmpl
+++ b/nikola/data/themes/bootstrap3/templates/base.tmpl
@@ -87,10 +87,16 @@ ${base.late_load_js()}
     </script>
     <!-- end fancy dates -->
     <%block name="extra_js"></%block>
-    <script>baguetteBox.run('a.reference', {
+    <script>
+    baguetteBox.run('a.reference:not(.islink)', {
         captions: function(element) {
             return element.getElementsByTagName('img')[0].alt;
-    }});</script>
+    }});
+    baguetteBox.run('img:not(.islink)', {
+        captions: function(element) {
+            return element.alt;
+    }});
+    </script>
 ${body_end}
 ${template_hooks['body_end']()}
 </body>