diff --git a/packages/repo-tools/templates/typescript-backstage/modelGeneric.mustache b/packages/repo-tools/templates/typescript-backstage/modelGeneric.mustache
index 67954c0378..ce42680532 100644
--- a/packages/repo-tools/templates/typescript-backstage/modelGeneric.mustache
+++ b/packages/repo-tools/templates/typescript-backstage/modelGeneric.mustache
@@ -8,9 +8,7 @@
 {{/description}}
 {{^isEnum}}
 export interface {{classname}} {
-{{#additionalPropertiesType}}
-    [key: string]: {{{additionalPropertiesType}}};
-{{/additionalPropertiesType}}
+{{>modelGenericAdditionalProperties}}
 {{#vars}}
 {{#description}}
     /**