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 40691696ab44..5f95b5a16fe3 100644
--- a/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
+++ b/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
@@ -103,7 +103,7 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
     {{#required}}
     {{#isArray}}
     local_var_req_builder = match "{{collectionFormat}}" {
-        "multi" => local_var_req_builder.query(&{{{paramName}}}.into_iter().map(|p| ("{{{baseName}}}".to_owned(), p)).collect::<Vec<(std::string::String, std::string::String)>>()),
+        "multi" => local_var_req_builder.query(&{{{paramName}}}.into_iter().map(|p| ("{{{baseName}}}".to_owned(), p.to_string())).collect::<Vec<(std::string::String, std::string::String)>>()),
         _ => local_var_req_builder.query(&[("{{{baseName}}}", &{{{paramName}}}.into_iter().map(|p| p.to_string()).collect::<Vec<String>>().join(",").to_string())]),
     };
     {{/isArray}}