diff --git a/examples/simple_loopback.c b/examples/simple_loopback.c
index 7b24f45f..c8318d6d 100644
--- a/examples/simple_loopback.c
+++ b/examples/simple_loopback.c
@@ -21,7 +21,7 @@ void data_callback(ma_device* pDevice, void* pOutput, const void* pInput, ma_uin
     ma_encoder* pEncoder = (ma_encoder*)pDevice->pUserData;
     MA_ASSERT(pEncoder != NULL);
 
-    ma_encoder_write_pcm_frames(pEncoder, pInput, frameCount);
+    ma_encoder_write_pcm_frames(pEncoder, pInput, frameCount, NULL);
 
     (void)pOutput;
 }