diff --git a/modules/openapi-generator/src/main/resources/rust/request.rs b/modules/openapi-generator/src/main/resources/rust/request.rs
index b516ccb0f9a..81497706a11 100644
--- a/modules/openapi-generator/src/main/resources/rust/request.rs
+++ b/modules/openapi-generator/src/main/resources/rust/request.rs
@@ -198,7 +198,7 @@ impl Request {
 
         let req_headers = req_builder.headers_mut().unwrap();
         let request_result = if self.form_params.len() > 0 {
-            req_headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/ x-www-form-urlencoded"));
+            req_headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/x-www-form-urlencoded"));
             let mut enc = ::url::form_urlencoded::Serializer::new("".to_owned());
             for (k, v) in self.form_params {
                 enc.append_pair(&k, &v);
diff --git a/samples/client/petstore/rust/hyper/petstore/src/apis/request.rs b/samples/client/petstore/rust/hyper/petstore/src/apis/request.rs
index b516ccb0f9a..81497706a11 100644
--- a/samples/client/petstore/rust/hyper/petstore/src/apis/request.rs
+++ b/samples/client/petstore/rust/hyper/petstore/src/apis/request.rs
@@ -198,7 +198,7 @@ impl Request {
 
         let req_headers = req_builder.headers_mut().unwrap();
         let request_result = if self.form_params.len() > 0 {
-            req_headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/ x-www-form-urlencoded"));
+            req_headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/x-www-form-urlencoded"));
             let mut enc = ::url::form_urlencoded::Serializer::new("".to_owned());
             for (k, v) in self.form_params {
                 enc.append_pair(&k, &v);