diff --git a/src/generator/templates/api-endpoint.njk b/src/generator/templates/api-endpoint.njk
index 19d7ea0d0c1..27669ae7845 100644
--- a/src/generator/templates/api-endpoint.njk
+++ b/src/generator/templates/api-endpoint.njk
@@ -45,7 +45,7 @@ interface StandardParameters {
   /**
     * {{ p.description|oneLine|cleanComments|safe }}
     */
-  {{ pname|cleanPropertyName|safe }}?: {{ p.type }};
+  {{ pname|cleanPropertyName|safe }}?: {{ p.type }}{% if p.repeated %}[]{% endif %};
   {% endfor %}
 }
 
@@ -142,7 +142,7 @@ export interface Schema${{ schema.id }} {
         /**
          * {{ p.description|oneLine|cleanComments|safe }}
          */
-        {{ pname|getSafeParamName }}?: {{ p.type }};
+        {{ pname|getSafeParamName }}?: {{ p.type }}{% if p.repeated %}[]{% endif %};
         {% endfor %}
       {% endif %}
 
diff --git a/src/generator/templates/resource-partial.njk b/src/generator/templates/resource-partial.njk
index 0bb385eb36d..11f4345454b 100644
--- a/src/generator/templates/resource-partial.njk
+++ b/src/generator/templates/resource-partial.njk
@@ -47,7 +47,7 @@
               /**
                * {{ p.description|oneLine|cleanComments|safe }}
                */
-              {{ pname|cleanPropertyName|safe }}?: {{ p|getType }};
+              {{ pname|cleanPropertyName|safe }}?: {{ p|getType }}{% if p.repeated %}[]{% endif %};
             {% endfor %}
           {% endif %}