diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustServerCodegen.java
index 16e2da7a78c..406caa69c1d 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustServerCodegen.java
@@ -544,7 +544,7 @@ public class RustServerCodegen extends DefaultCodegen implements CodegenConfig {
     }
 
     private boolean isMimetypePlain(String mimetype) {
-      return isMimetypePlainText(mimetype) || isMimetypeHtmlText(mimetype) || isMimetypeOctetStream(mimetype);
+        return isMimetypePlainText(mimetype) || isMimetypeHtmlText(mimetype) || isMimetypeOctetStream(mimetype);
     }
 
     @Override
@@ -560,7 +560,7 @@ public class RustServerCodegen extends DefaultCodegen implements CodegenConfig {
 
             pathFormatString = pathFormatString.replace(paramSearch, paramReplace);
         }
-        op.vendorExtensions.put("pathFormatString", pathFormatString);
+        op.vendorExtensions.put("x-path-format-string", pathFormatString);
 
         // The Rust code will need to contain a series of regular expressions.
         // For performance, we'll construct these at start-of-day and re-use
@@ -1019,7 +1019,7 @@ public class RustServerCodegen extends DefaultCodegen implements CodegenConfig {
                     am.getItems() != null &&
                     !StringUtils.isEmpty(am.getItems().get$ref())) {
                 Schema inner_schema = allDefinitions.get(
-                    ModelUtils.getSimpleRef(am.getItems().get$ref()));
+                        ModelUtils.getSimpleRef(am.getItems().get$ref()));
 
                 if (inner_schema.getXml() != null &&
                         inner_schema.getXml().getName() != null) {
@@ -1271,9 +1271,7 @@ public class RustServerCodegen extends DefaultCodegen implements CodegenConfig {
                     // the user than the alternative.
                     LOGGER.warn("Ignoring additionalProperties (see https://github.com/OpenAPITools/openapi-generator/issues/318) alongside defined properties");
                     cm.dataType = null;
-                }
-                else
-                {
+                } else {
                     String type;
 
                     if (typeMapping.containsKey(cm.additionalPropertiesType)) {
diff --git a/modules/openapi-generator/src/main/resources/rust-server/client-mod.mustache b/modules/openapi-generator/src/main/resources/rust-server/client-mod.mustache
index 4bc03901ad4..575e7fee69a 100644
--- a/modules/openapi-generator/src/main/resources/rust-server/client-mod.mustache
+++ b/modules/openapi-generator/src/main/resources/rust-server/client-mod.mustache
@@ -262,7 +262,7 @@ impl<F, C> Api<C> for Client<F> where
 {{#apiInfo}}{{#apis}}{{#operations}}{{#operation}}
     fn {{#vendorExtensions}}{{{operation_id}}}{{/vendorExtensions}}(&self{{#allParams}}, param_{{{paramName}}}: {{^required}}Option<{{/required}}{{#isListContainer}}&{{/isListContainer}}{{{dataType}}}{{^required}}>{{/required}}{{/allParams}}, context: &C) -> Box<dyn Future<Item={{{operationId}}}Response, Error=ApiError>> {
         let mut uri = format!(
-            "{}{{{basePathWithoutHost}}}{{#vendorExtensions}}{{pathFormatString}}{{/vendorExtensions}}",
+            "{}{{{basePathWithoutHost}}}{{{vendorExtensions.x-path-format-string}}}",
             self.base_path{{#pathParams}}, {{{paramName}}}=utf8_percent_encode(&param_{{{paramName}}}.to_string(), ID_ENCODE_SET){{/pathParams}}
         );
 
diff --git a/samples/server/petstore/rust-server/output/petstore-with-fake-endpoints-models-for-testing/api/openapi.yaml b/samples/server/petstore/rust-server/output/petstore-with-fake-endpoints-models-for-testing/api/openapi.yaml
index 8e1b2de1432..e94a4c5fe98 100644
--- a/samples/server/petstore/rust-server/output/petstore-with-fake-endpoints-models-for-testing/api/openapi.yaml
+++ b/samples/server/petstore/rust-server/output/petstore-with-fake-endpoints-models-for-testing/api/openapi.yaml
@@ -996,7 +996,7 @@ paths:
         schema:
           type: string
       responses:
-        200:
+        "200":
           content: {}
           description: Success
       tags: