diff --git a/packages/plugin-ext/src/main/browser/custom-editors/custom-editor-opener.tsx b/packages/plugin-ext/src/main/browser/custom-editors/custom-editor-opener.tsx
index 5f560b23ff1cf..34efbb9c8abfc 100644
--- a/packages/plugin-ext/src/main/browser/custom-editors/custom-editor-opener.tsx
+++ b/packages/plugin-ext/src/main/browser/custom-editors/custom-editor-opener.tsx
@@ -85,7 +85,7 @@ export class CustomEditorOpener implements OpenHandler {
 
     selectorMatches(selector: CustomEditorSelector, resource: URI): boolean {
         if (selector.filenamePattern) {
-            if (glob.match(selector.filenamePattern.toLowerCase(), resource.path.ext.toLowerCase())) {
+            if (glob.match(selector.filenamePattern.toLowerCase(), resource.path.name.toLowerCase() + resource.path.ext.toLowerCase())) {
                 return true;
             }
         }