diff --git a/modules/openapi-generator/src/main/resources/typescript-inversify/modelGeneric.mustache b/modules/openapi-generator/src/main/resources/typescript-inversify/modelGeneric.mustache
index c9da208072e..0169ba55d86 100644
--- a/modules/openapi-generator/src/main/resources/typescript-inversify/modelGeneric.mustache
+++ b/modules/openapi-generator/src/main/resources/typescript-inversify/modelGeneric.mustache
@@ -5,6 +5,6 @@ export interface {{classname}} {{#parent}}extends {{{parent}}} {{/parent}}{ {{>m
      * {{{description}}}
      */
     {{/description}}
-    {{#isReadOnly}}readonly {{/isReadOnly}}{{name}}{{^required}}?{{/required}}: {{#isEnum}}{{{datatypeWithEnum}}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}};
+    {{#isReadOnly}}readonly {{/isReadOnly}}{{name}}{{^required}}?{{/required}}: {{#isEnum}}{{{datatypeWithEnum}}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}}{{#isNullable}} | null{{/isNullable}};
 {{/vars}}
 }{{>modelGenericEnums}}
\ No newline at end of file