diff --git a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-vertx/api.mustache b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-vertx/api.mustache
index 851ac96c2daf..41c15c97ea25 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-vertx/api.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-vertx/api.mustache
@@ -104,7 +104,7 @@ import {{packageName}}.infrastructure.*
     {{#isDeprecated}}
     @Deprecated(message = "This operation is deprecated.")
     {{/isDeprecated}}
-    {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}{{#useCoroutines}}suspend {{/useCoroutines}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{#isEnum}}{{#isContainer}}kotlin.collections.List<{{enumName}}{{operationIdCamelCase}}>{{/isContainer}}{{^isContainer}}{{enumName}}{{operationIdCamelCase}}{{/isContainer}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}}{{#required}}{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{^isNumber}}{{{defaultValue}}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{^-last}}, {{/-last}}{{/allParams}}) : {{^useCoroutines}}Future<{{/useCoroutines}}{{#returnType}}{{{returnType}}}{{#nullableReturnType}}{{^isResponseOptional}}?{{/isResponseOptional}}{{/nullableReturnType}}{{#isResponseOptional}}?{{/isResponseOptional}}{{/returnType}}{{^returnType}}Unit{{/returnType}}{{^useCoroutines}}>{{/useCoroutines}} {
+    {{^nonPublicApi}}{{#explicitApi}}public {{/explicitApi}}{{/nonPublicApi}}{{#useCoroutines}}suspend {{/useCoroutines}}fun {{operationId}}({{#allParams}}{{{paramName}}}: {{#isEnum}}{{#isContainer}}kotlin.collections.List<{{enumName}}{{operationIdCamelCase}}>{{/isContainer}}{{^isContainer}}{{enumName}}{{operationIdCamelCase}}{{/isContainer}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}}{{#required}}{{#defaultValue}} = {{^isNumber}}{{#isEnum}}{{enumName}}{{operationIdCamelCase}}.{{enumDefaultValue}}{{/isEnum}}{{^isEnum}}{{{defaultValue}}}{{/isEnum}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{/required}}{{^required}}?{{#defaultValue}} = {{^isNumber}}{{#isEnum}}{{enumName}}{{operationIdCamelCase}}.{{enumDefaultValue}}{{/isEnum}}{{^isEnum}}{{{defaultValue}}}{{/isEnum}}{{/isNumber}}{{#isNumber}}{{{dataType}}}("{{{defaultValue}}}"){{/isNumber}}{{/defaultValue}}{{^defaultValue}} = null{{/defaultValue}}{{/required}}{{^-last}}, {{/-last}}{{/allParams}}) : {{^useCoroutines}}Future<{{/useCoroutines}}{{#returnType}}{{{returnType}}}{{#nullableReturnType}}{{^isResponseOptional}}?{{/isResponseOptional}}{{/nullableReturnType}}{{#isResponseOptional}}?{{/isResponseOptional}}{{/returnType}}{{^returnType}}Unit{{/returnType}}{{^useCoroutines}}>{{/useCoroutines}} {
         return {{operationId}}WithHttpInfo({{#allParams}}{{{paramName}}} = {{{paramName}}}{{^-last}}, {{/-last}}{{/allParams}}).map { localVarResponse ->
             when (localVarResponse.responseType) {
                 ResponseType.Success -> {{#returnType}}(localVarResponse as Success<*>).data as {{{returnType}}}{{#nullableReturnType}}{{^isResponseOptional}}?{{/isResponseOptional}}{{/nullableReturnType}}{{#isResponseOptional}}?{{/isResponseOptional}}{{/returnType}}{{^returnType}}Unit{{/returnType}}