diff --git a/modules/openapi-generator/src/main/resources/rust/model.mustache b/modules/openapi-generator/src/main/resources/rust/model.mustache
index 1bd2b8db9e0..8e4dac90ce8 100644
--- a/modules/openapi-generator/src/main/resources/rust/model.mustache
+++ b/modules/openapi-generator/src/main/resources/rust/model.mustache
@@ -82,7 +82,7 @@ impl {{{classname}}} {
     pub fn new({{#requiredVars}}{{{name}}}: {{#isNullable}}Option<{{/isNullable}}{{#isEnum}}{{{enumName}}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}}{{#isNullable}}>{{/isNullable}}{{^-last}}, {{/-last}}{{/requiredVars}}) -> {{{classname}}} {
         {{{classname}}} {
             {{#vars}}
-            {{{name}}}{{^required}}{{#isArray}}: None{{/isArray}}{{#isMap}}: None{{/isMap}}{{^isContainer}}: None{{/isContainer}}{{/required}}{{#required}}{{#isModel}}: Box::new({{{name}}}){{/isModel}}{{/required}},
+            {{{name}}}{{^required}}{{#isArray}}: None{{/isArray}}{{#isMap}}: None{{/isMap}}{{^isContainer}}: None{{/isContainer}}{{/required}}{{#required}}{{#isModel}}: {{^isNullable}}Box::new({{{name}}}){{/isNullable}}{{#isNullable}}if let Some(x) = {{{name}}} {Some(Box::new(x))} else {None}{{/isNullable}}{{/isModel}}{{/required}},
             {{/vars}}
         }
     }