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 e41aaea20c7..c37112258ba 100644
--- a/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
+++ b/modules/openapi-generator/src/main/resources/rust/reqwest/api.mustache
@@ -211,18 +211,18 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
     {{^isFile}}
     {{#required}}
     {{^isNullable}}
-    local_var_form = local_var_form.text("{{{baseName}}}", {{{paramName}}}{{#isArray}}.join(","){{/isArray}}.to_string());
+    local_var_form = local_var_form.text("{{{baseName}}}", {{{paramName}}}{{#isArray}}.into_iter().map(|p| p.to_string()).collect::<Vec<String>>().join(","){{/isArray}}.to_string());
     {{/isNullable}}
     {{#isNullable}}
     match {{{paramName}}} {
-        Some(local_var_param_value) => { local_var_form = local_var_form.text("{{{baseName}}}", local_var_param_value{{#isArray}}.join(","){{/isArray}}.to_string()); },
+        Some(local_var_param_value) => { local_var_form = local_var_form.text("{{{baseName}}}", local_var_param_value{{#isArray}}.into_iter().map(|p| p.to_string()).collect::<Vec<String>>().join(","){{/isArray}}.to_string()); },
         None => { local_var_form = local_var_form.text("{{{baseName}}}", ""); },
     }
     {{/isNullable}}
     {{/required}}
     {{^required}}
     if let Some(local_var_param_value) = {{{paramName}}} {
-        local_var_form = local_var_form.text("{{{baseName}}}", local_var_param_value{{#isArray}}.join(","){{/isArray}}.to_string());
+        local_var_form = local_var_form.text("{{{baseName}}}", local_var_param_value{{#isArray}}.into_iter().map(|p| p.to_string()).collect::<Vec<String>>().join(","){{/isArray}}.to_string());
     }
     {{/required}}
     {{/isFile}}
@@ -255,18 +255,18 @@ pub {{#supportAsync}}async {{/supportAsync}}fn {{{operationId}}}(configuration:
     {{^isFile}}
     {{#required}}
     {{^isNullable}}
-    local_var_form_params.insert("{{{baseName}}}", {{{paramName}}}{{#isArray}}.join(","){{/isArray}}.to_string());
+    local_var_form_params.insert("{{{baseName}}}", {{{paramName}}}{{#isArray}}.into_iter().map(|p| p.to_string()).collect::<Vec<String>>().join(","){{/isArray}}.to_string());
     {{/isNullable}}
     {{#isNullable}}
     match {{{paramName}}} {
-        Some(local_var_param_value) => { local_var_form_params.insert("{{{baseName}}}", local_var_param_value{{#isArray}}.join(","){{/isArray}}.to_string()); },
+        Some(local_var_param_value) => { local_var_form_params.insert("{{{baseName}}}", local_var_param_value{{#isArray}}.into_iter().map(|p| p.to_string()).collect::<Vec<String>>().join(","){{/isArray}}.to_string()); },
         None => { local_var_form_params.insert("{{{baseName}}}", ""); },
     }
     {{/isNullable}}
     {{/required}}
     {{^required}}
     if let Some(local_var_param_value) = {{{paramName}}} {
-        local_var_form_params.insert("{{{baseName}}}", local_var_param_value{{#isArray}}.join(","){{/isArray}}.to_string());
+        local_var_form_params.insert("{{{baseName}}}", local_var_param_value{{#isArray}}.into_iter().map(|p| p.to_string()).collect::<Vec<String>>().join(","){{/isArray}}.to_string());
     }
     {{/required}}
     {{/isFile}}