diff --git a/src/extensions/scratch3_speech/index.js b/src/extensions/scratch3_speech/index.js
index 9ffc24fa5..f72e02e84 100644
--- a/src/extensions/scratch3_speech/index.js
+++ b/src/extensions/scratch3_speech/index.js
@@ -7,17 +7,17 @@ const DiffMatchPatch = require('diff-match-patch');
 
 /**
  * Url of icon to be displayed at the left edge of each extension block.
- * TODO: Find the final Icon. Replace it with the right format. data URI?
  * @type {string}
  */
-const iconURI = 'https://www.gstatic.com/images/icons/material/system/1x/mic_white_24dp.png';
+const iconURI = 'data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNCIgaGVpZ2h0PSIyNCIgdmlld0JveD0iMCAwIDI0IDI0IiBmaWxsPSIjRkZGRkZGIj48cGF0aCBkPSJNMTIgMTRjMS42NiAwIDIuOTktMS4zNCAyLjk5LTNMMTUgNWMwLTEuNjYtMS4zNC0zLTMtM1M5IDMuMzQgOSA1djZjMCAxLjY2IDEuMzQgMyAzIDN6bTUuMy0zYzAgMy0yLjU0IDUuMS01LjMgNS4xUzYuNyAxNCA2LjcgMTFINWMwIDMuNDEgMi43MiA2LjIzIDYgNi43MlYyMWgydi0zLjI4YzMuMjgtLjQ4IDYtMy4zIDYtNi43MmgtMS43eiIvPjxwYXRoIGQ9Ik0wIDBoMjR2MjRIMHoiIGZpbGw9Im5vbmUiLz48L3N2Zz4K';
+
 
 /**
  * Url of icon to be displayed in the toolbox menu for the extension category.
- * TODO: Find the final Icon. Replace it with the right format. data URI?
  * @type {string}
  */
-const menuIconURI = 'https://www.gstatic.com/images/icons/material/system/1x/mic_grey600_24dp.png';
+const menuIconURI = 'data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyNHB4IiBoZWlnaHQ9IjI0cHgiIHZpZXdCb3g9IjAgMCAyNCAyNCIgZmlsbD0iIzc1NzU3NSI+CiAgICA8cGF0aCBkPSJNMTIgMTRjMS42NiAwIDIuOTktMS4zNCAyLjk5LTNMMTUgNWMwLTEuNjYtMS4zNC0zLTMtM1M5IDMuMzQgOSA1djZjMCAxLjY2IDEuMzQgMyAzIDN6bTUuMy0zYzAgMy0yLjU0IDUuMS01LjMgNS4xUzYuNyAxNCA2LjcgMTFINWMwIDMuNDEgMi43MiA2LjIzIDYgNi43MlYyMWgydi0zLjI4YzMuMjgtLjQ4IDYtMy4zIDYtNi43MmgtMS43eiIvPgogICAgPHBhdGggZD0iTTAgMGgyNHYyNEgweiIgZmlsbD0ibm9uZSIvPgo8L3N2Zz4K';
+
 
 /**
  * The url of the speech server.