diff --git a/getting_started_student.ipynb b/getting_started_student.ipynb
index 73cc33e61b11a6c7c2f365d5daa957337eda94be..20751907bf2611036747f2e8eaaac53898d82292 100644
--- a/getting_started_student.ipynb
+++ b/getting_started_student.ipynb
@@ -302,7 +302,7 @@
         "\r\n",
         "\"Library Librosa computing stft\"\r\n",
         "stft2 = librosa.stft(x, n_fft=Nft, hop_length=Nft, window='hamm', center='False') # without downsampling the signal\r\n",
-        "stft4 = np.abs(librosa.stft(z, n_fft=Nft, hop_length=Nft, window='hamm', center=False))\r\n",
+        "stft4 = np.abs(librosa.stft(y, n_fft=Nft, hop_length=Nft, window='hamm', center=False))\r\n",
         "\r\n",
         "print(\"Note: You can eventually add a \\\"+1\\\" in the \\\"np.log\\\" to get positive dB. This will look differently.\")\r\n",
         "\r\n",