diff --git a/sherpa-onnx/c-api/c-api.cc b/sherpa-onnx/c-api/c-api.cc
index 3f36d1a7f..625f608a9 100644
--- a/sherpa-onnx/c-api/c-api.cc
+++ b/sherpa-onnx/c-api/c-api.cc
@@ -1281,7 +1281,6 @@ const SherpaOnnxGeneratedAudio *SherpaOnnxOfflineTtsGenerateWithCallbackWithArg(
 void SherpaOnnxDestroyOfflineTtsGeneratedAudio(
     const SherpaOnnxGeneratedAudio *p) {
   SHERPA_ONNX_LOGE("TTS is not enabled. Please rebuild sherpa-onnx");
-  return nullptr;
 }
 
 #endif  // SHERPA_ONNX_ENABLE_TTS == 1