diff --git a/tutorials/asr/Online_Offline_Microphone_VAD_Demo.ipynb b/tutorials/asr/Online_Offline_Microphone_VAD_Demo.ipynb
index 490a4b6c8de7..9522ac0a80e5 100644
--- a/tutorials/asr/Online_Offline_Microphone_VAD_Demo.ipynb
+++ b/tutorials/asr/Online_Offline_Microphone_VAD_Demo.ipynb
@@ -638,7 +638,7 @@
                 "    ax2.set_ylabel('Preds and Probas')\n",
                 "    \n",
                 "    \n",
-                "ax = plt.subplot(num+1,1,i+2)\n",
+                "ax = plt.subplot(num+1,1,num+1)\n",
                 "S = librosa.feature.melspectrogram(y=audio, sr=sample_rate, n_mels=64, fmax=8000)\n",
                 "S_dB = librosa.power_to_db(S, ref=np.max)\n",
                 "librosa.display.specshow(S_dB, x_axis='time', y_axis='mel', sr=sample_rate, fmax=8000)\n",