diff --git a/dist/hugo_shortcodes_netlify_cms.js b/dist/hugo_shortcodes_netlify_cms.js
index 21f28d8..f0b44eb 100644
--- a/dist/hugo_shortcodes_netlify_cms.js
+++ b/dist/hugo_shortcodes_netlify_cms.js
@@ -137,7 +137,7 @@ CMS.registerEditorComponent({
         label: "Youtube Video ID",
         widget: "string"
     }],
-    pattern: /{{< youtube\s+(?<id>[A-Za-z0-9\-]+)\s+>}}/,
+    pattern: /{{< youtube\s+(?<id>[A-Za-z0-9\-_]+)\s+>}}/,
     fromBlock: function(match) {
         return {
             id: match[1],
diff --git a/src/youtube.js b/src/youtube.js
index 1ce8197..ab014a7 100644
--- a/src/youtube.js
+++ b/src/youtube.js
@@ -6,7 +6,7 @@ CMS.registerEditorComponent({
         label: "Youtube Video ID",
         widget: "string"
     }],
-    pattern: /{{< youtube\s+(?<id>[A-Za-z0-9\-]+)\s+>}}/,
+    pattern: /{{< youtube\s+(?<id>[A-Za-z0-9\-_]+)\s+>}}/,
     fromBlock: function(match) {
         return {
             id: match[1],