diff --git a/modules/openapi-generator/src/main/resources/rust/hyper/api.mustache b/modules/openapi-generator/src/main/resources/rust/hyper/api.mustache
index ded6202a35aa..e2833f16ed90 100644
--- a/modules/openapi-generator/src/main/resources/rust/hyper/api.mustache
+++ b/modules/openapi-generator/src/main/resources/rust/hyper/api.mustache
@@ -34,7 +34,7 @@ pub trait {{{classname}}} {
 impl<C: hyper::client::Connect>{{{classname}}} for {{{classname}}}Client<C> {
 {{#operations}}
 {{#operation}}
-    fn {{{operationId}}}(&self, {{#allParams}}{{{paramName}}}: {{^required}}Option<{{/required}}{{#required}}{{#isNullable}}Option<{{/isNullable}}{{/required}}{{#isString}}&str{{/isString}}{{#isUuid}}&str{{/isUuid}}{{^isString}}{{^isUuid}}{{^isPrimitiveType}}{{^isContainer}}crate::models::{{/isContainer}}{{/isPrimitiveType}}{{{dataType}}}{{/isUuid}}{{/isString}}{{^required}}>{{/required}}{{#required}}{{#isNullable}}>{{/isNullable}}{{/required}}{{^-last}}, {{/-last}}{{/allParams}}) -> Box<dyn Future<Item = {{^returnType}}(){{/returnType}}{{{returnType}}}, Error = Error<serde_json::Value>>> {
+    fn {{{operationId}}}(&self, {{#allParams}}{{{paramName}}}: {{^required}}Option<{{/required}}{{#required}}{{#isNullable}}Option<{{/isNullable}}{{/required}}{{#isString}}{{^isUuid}}&str{{/isUuid}}{{/isString}}{{#isUuid}}&str{{/isUuid}}{{^isString}}{{^isUuid}}{{^isPrimitiveType}}{{^isContainer}}crate::models::{{/isContainer}}{{/isPrimitiveType}}{{{dataType}}}{{/isUuid}}{{/isString}}{{^required}}>{{/required}}{{#required}}{{#isNullable}}>{{/isNullable}}{{/required}}{{^-last}}, {{/-last}}{{/allParams}}) -> Box<dyn Future<Item = {{^returnType}}(){{/returnType}}{{{returnType}}}, Error = Error<serde_json::Value>>> {
         let mut req = __internal_request::Request::new(hyper::Method::{{{httpMethod}}}, "{{{path}}}".to_string())
         {{#hasAuthMethods}}
         {{#authMethods}}
diff --git a/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache b/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
index 0e13e0ab8cca..867ba22a254f 100644
--- a/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
+++ b/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
@@ -90,7 +90,7 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
 
 {{/vendorExtensions.x-group-parameters}}
 {{^vendorExtensions.x-group-parameters}}
-pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration: &configuration::Configuration, {{#allParams}}{{{paramName}}}: {{^required}}Option<{{/required}}{{#required}}{{#isNullable}}Option<{{/isNullable}}{{/required}}{{#isString}}{{#isArray}}Vec<{{/isArray}}&str{{#isArray}}>{{/isArray}}{{/isString}}{{#isUuid}}{{#isArray}}Vec<{{/isArray}}&str{{#isArray}}>{{/isArray}}{{/isUuid}}{{^isString}}{{^isUuid}}{{^isPrimitiveType}}{{^isContainer}}{{#isBodyParam}}crate::models::{{/isBodyParam}}{{/isContainer}}{{/isPrimitiveType}}{{{dataType}}}{{/isUuid}}{{/isString}}{{^required}}>{{/required}}{{#required}}{{#isNullable}}>{{/isNullable}}{{/required}}{{^-last}}, {{/-last}}{{/allParams}}) -> Result<{{#supportMultipleResponses}}ResponseContent<{{{operationIdCamelCase}}}Success>{{/supportMultipleResponses}}{{^supportMultipleResponses}}{{^returnType}}(){{/returnType}}{{{returnType}}}{{/supportMultipleResponses}}, Error<{{{operationIdCamelCase}}}Error>> {
+pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration: &configuration::Configuration, {{#allParams}}{{{paramName}}}: {{^required}}Option<{{/required}}{{#required}}{{#isNullable}}Option<{{/isNullable}}{{/required}}{{#isString}}{{#isArray}}Vec<{{/isArray}}{{^isUuid}}&str{{/isUuid}}{{#isArray}}>{{/isArray}}{{/isString}}{{#isUuid}}{{#isArray}}Vec<{{/isArray}}&str{{#isArray}}>{{/isArray}}{{/isUuid}}{{^isString}}{{^isUuid}}{{^isPrimitiveType}}{{^isContainer}}{{#isBodyParam}}crate::models::{{/isBodyParam}}{{/isContainer}}{{/isPrimitiveType}}{{{dataType}}}{{/isUuid}}{{/isString}}{{^required}}>{{/required}}{{#required}}{{#isNullable}}>{{/isNullable}}{{/required}}{{^-last}}, {{/-last}}{{/allParams}}) -> Result<{{#supportMultipleResponses}}ResponseContent<{{{operationIdCamelCase}}}Success>{{/supportMultipleResponses}}{{^supportMultipleResponses}}{{^returnType}}(){{/returnType}}{{{returnType}}}{{/supportMultipleResponses}}, Error<{{{operationIdCamelCase}}}Error>> {
     let local_var_configuration = configuration;
 {{/vendorExtensions.x-group-parameters}}