diff --git a/src/js/simplemde.js b/src/js/simplemde.js
index ab5f88d..4999651 100644
--- a/src/js/simplemde.js
+++ b/src/js/simplemde.js
@@ -68,6 +68,7 @@ function createIcon(options, enableTooltips) {
 		}
 	}
 
+	el.tabIndex = -1;
 	el.className = options.className;
 	return el;
 }