diff --git a/book/book.tex b/book/book.tex
index 1bd632f8..055b710b 100644
--- a/book/book.tex
+++ b/book/book.tex
@@ -5932,7 +5932,7 @@ \section{Acoustic response}
 Here's the gunshot:
 
 \begin{verbatim}
-    response = thinkdsp.read_wave('180961__kleeb__gunshots.wav')
+    response = thinkdsp.read_wave('180960__kleeb__gunshots.wav')
     response = response.segment(start=0.26, duration=5.0)
     response.normalize()
     response.plot()