diff --git a/src/v3.ts b/src/v3.ts
index ce9bbe12a..220963cbd 100644
--- a/src/v3.ts
+++ b/src/v3.ts
@@ -74,7 +74,7 @@ export default function generateTypesV3(
         // if additional properties, add to end of properties
         if (node.additionalProperties) {
           properties += `[key: string]: ${
-            nodeType(node.additionalProperties) || "any"
+            transform(node.additionalProperties as any) || "any"
           };\n`;
         }
 
diff --git a/tests/v3/expected/stripe.ts b/tests/v3/expected/stripe.ts
index a50bab0b0..67e18e5dd 100644
--- a/tests/v3/expected/stripe.ts
+++ b/tests/v3/expected/stripe.ts
@@ -1744,7 +1744,7 @@ export interface components {
       /**
        * Currencies that can be accepted in the specific country (for transfers).
        */
-      supported_bank_account_currencies: { [key: string]: array };
+      supported_bank_account_currencies: { [key: string]: string[] };
       /**
        * Currencies that can be accepted in the specified country (for payments).
        */
diff --git a/tests/v3/index.test.ts b/tests/v3/index.test.ts
index 7de9bdc3d..91a83232e 100644
--- a/tests/v3/index.test.ts
+++ b/tests/v3/index.test.ts
@@ -279,6 +279,13 @@ describe("OpenAPI3 features", () => {
             properties: { string: { type: "string" } },
             additionalProperties: { type: "string" },
           },
+          additional_properties_array: {
+            type: "object",
+            additionalProperties: {
+              type: "array",
+              items: { type: "number"},
+            }
+          }
         },
       },
     };
@@ -288,6 +295,7 @@ describe("OpenAPI3 features", () => {
         schemas: {
           additional_properties: { number?: number; [key: string]: any };
           additional_properties_string: { string?: string; [key: string]: string };
+          additional_properties_array: { [key:string]: number[] };
         }
       }`)
     );