diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/SwiftCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/SwiftCodegen.java
index 2d7a4244529..9f190761f83 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/SwiftCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/SwiftCodegen.java
@@ -293,6 +293,21 @@ public class SwiftCodegen extends DefaultCodegen implements CodegenConfig {
     return initialCaps(name) + "API";
   }
 
+  @Override
+  public String toOperationId(String operationId) {
+    // throw exception if method name is empty
+    if (StringUtils.isEmpty(operationId)) {
+      throw new RuntimeException("Empty method name (operationId) not allowed");
+    }
+
+    // method name cannot use reserved keyword, e.g. return
+    if (reservedWords.contains(operationId)) {
+      throw new RuntimeException(operationId + " (reserved word) cannot be used as method name");
+    }
+
+    return camelize(sanitizeName(operationId), true);
+  }
+
   @Override
   public CodegenOperation fromOperation(String path, String httpMethod, Operation operation, Map<String, Model> definitions, Swagger swagger) {
     path = normalizePath(path); // FIXME: a parameter should not be assigned. Also declare the methods parameters as 'final'.