diff --git a/metadata-service/openapi-servlet/src/main/java/io/datahubproject/openapi/v3/OpenAPIV3Generator.java b/metadata-service/openapi-servlet/src/main/java/io/datahubproject/openapi/v3/OpenAPIV3Generator.java
index 349672ef2dcecc..44f50c1a8d10fd 100644
--- a/metadata-service/openapi-servlet/src/main/java/io/datahubproject/openapi/v3/OpenAPIV3Generator.java
+++ b/metadata-service/openapi-servlet/src/main/java/io/datahubproject/openapi/v3/OpenAPIV3Generator.java
@@ -725,13 +725,16 @@ private static Schema buildAspectsRefResponseSchema(final EntityRegistry entityR
             .description(ASPECT_DESCRIPTION)
             .required(List.of(PROPERTY_VALUE));
 
-    entityRegistry
-        .getAspectSpecs()
-        .values()
-        .forEach(
-            aspect ->
-                result.addProperty(
-                    PROPERTY_VALUE, new Schema<>().$ref(PATH_DEFINITIONS + aspect.getName())));
+    // Create a list of reference schemas for each aspect
+    List<Schema> aspectRefs =
+        entityRegistry.getAspectSpecs().values().stream()
+            .map(aspect -> new Schema<>().$ref(PATH_DEFINITIONS + toUpperFirst(aspect.getName())))
+            .distinct()
+            .collect(Collectors.toList());
+
+    // Add the value property with oneOf constraint
+    result.addProperty(PROPERTY_VALUE, new Schema<>().oneOf(aspectRefs));
+
     result.addProperty(
         NAME_SYSTEM_METADATA,
         new Schema<>()
diff --git a/metadata-service/openapi-servlet/src/test/java/io/datahubproject/openapi/v3/OpenAPIV3GeneratorTest.java b/metadata-service/openapi-servlet/src/test/java/io/datahubproject/openapi/v3/OpenAPIV3GeneratorTest.java
index d8f04b60455abb..30b8d823605393 100644
--- a/metadata-service/openapi-servlet/src/test/java/io/datahubproject/openapi/v3/OpenAPIV3GeneratorTest.java
+++ b/metadata-service/openapi-servlet/src/test/java/io/datahubproject/openapi/v3/OpenAPIV3GeneratorTest.java
@@ -105,5 +105,30 @@ public void testOpenApiSpecBuilder() throws Exception {
             entry ->
                 assertEquals(
                     "#/components/schemas/BatchGetRequestBody", entry.getValue().get$ref()));
+
+    // Assert aspect response schemas have value property with oneOf references
+    Schema<?> aspectResponseSchema =
+        openAPI.getComponents().getSchemas().get("AspectsAspectResponse_v3");
+    Schema<?> valueProperty = aspectResponseSchema.getProperties().get("value");
+    assertTrue(
+        valueProperty.getOneOf() != null && !valueProperty.getOneOf().isEmpty(),
+        "value property should use oneOf");
+
+    // Check each reference has proper format and capitalization
+    valueProperty
+        .getOneOf()
+        .forEach(
+            schema -> {
+              String ref = schema.get$ref();
+              assertTrue(
+                  ref != null && ref.startsWith("#/components/schemas/"),
+                  "reference should start with '#/components/schemas/': " + ref);
+
+              // Extract the last part after the last slash and check first character
+              String refName = ref.substring(ref.lastIndexOf('/') + 1);
+              assertTrue(
+                  Character.isUpperCase(refName.charAt(0)),
+                  "schema reference should start with capital letter: " + name);
+            });
   }
 }