diff --git a/Tests/OpenAITests/OpenAITests.swift b/Tests/OpenAITests/OpenAITests.swift
index 19a86fba..b10498ed 100644
--- a/Tests/OpenAITests/OpenAITests.swift
+++ b/Tests/OpenAITests/OpenAITests.swift
@@ -259,25 +259,25 @@ class OpenAITests: XCTestCase {
     }
     
     func testAudioSpeechDoesNotNormalize() async throws {
-        let query = AudioSpeechQuery(model: .tts_1, input: "Hello, world!", voice: .alloy, responseFormat: .mp3, speed: 2.0)
+        let query = AudioSpeechQuery(model: .tts_1, input: "Hello, world!", voice: .alloy, response_format: .mp3, speed: 2.0)
 
         XCTAssertEqual(query.speed, "\(2.0)")
     }
 
     func testAudioSpeechNormalizeNil() async throws {
-        let query = AudioSpeechQuery(model: .tts_1, input: "Hello, world!", voice: .alloy, responseFormat: .mp3, speed: nil)
+        let query = AudioSpeechQuery(model: .tts_1, input: "Hello, world!", voice: .alloy, response_format: .mp3, speed: nil)
 
         XCTAssertEqual(query.speed, "\(1.0)")
     }
 
     func testAudioSpeechNormalizeLow() async throws {
-        let query = AudioSpeechQuery(model: .tts_1, input: "Hello, world!", voice: .alloy, responseFormat: .mp3, speed: 0.0)
+        let query = AudioSpeechQuery(model: .tts_1, input: "Hello, world!", voice: .alloy, response_format: .mp3, speed: 0.0)
 
         XCTAssertEqual(query.speed, "\(0.25)")
     }
 
     func testAudioSpeechNormalizeHigh() async throws {
-        let query = AudioSpeechQuery(model: .tts_1, input: "Hello, world!", voice: .alloy, responseFormat: .mp3, speed: 10.0)
+        let query = AudioSpeechQuery(model: .tts_1, input: "Hello, world!", voice: .alloy, response_format: .mp3, speed: 10.0)
 
         XCTAssertEqual(query.speed, "\(4.0)")
     }