diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractPythonPydanticV1Codegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractPythonPydanticV1Codegen.java
index 7591c1df7c37..0fa3e5345f2a 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractPythonPydanticV1Codegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractPythonPydanticV1Codegen.java
@@ -908,7 +908,8 @@ private ModelsMap postProcessModelsMap(ModelsMap objs) {
 
                 // field
                 if (cp.baseName != null && !cp.baseName.equals(cp.name)) { // base name not the same as name
-                    fields.add(String.format(Locale.ROOT, "alias=\"%s\"", cp.baseName));
+                    fields.add(String.format(Locale.ROOT, "validation_alias=\"%s\"", cp.baseName));
+                    fields.add(String.format(Locale.ROOT, "serialization_alias=\"%s\"", cp.baseName));
                 }
 
                 if (!StringUtils.isEmpty(cp.description)) { // has description