diff --git a/extensions/ql-vscode/src/model-editor/modeled-method-fs.ts b/extensions/ql-vscode/src/model-editor/modeled-method-fs.ts
index 10a92ef63..5e8ad9347 100644
--- a/extensions/ql-vscode/src/model-editor/modeled-method-fs.ts
+++ b/extensions/ql-vscode/src/model-editor/modeled-method-fs.ts
@@ -89,7 +89,7 @@ export async function loadModeledMethods(
   for (const modeledMethods of Object.values(modeledMethodsByFile)) {
     for (const [key, value] of Object.entries(modeledMethods)) {
       if (!(key in existingModeledMethods)) {
-        existingModeledMethods[key] = value;
+        existingModeledMethods[key] = [];
       }
 
       existingModeledMethods[key].push(...value);