diff --git a/sherpa-onnx/csrc/offline-whisper-model.cc b/sherpa-onnx/csrc/offline-whisper-model.cc
index 7812e1d09..6327e5347 100644
--- a/sherpa-onnx/csrc/offline-whisper-model.cc
+++ b/sherpa-onnx/csrc/offline-whisper-model.cc
@@ -5,6 +5,7 @@
 #include "sherpa-onnx/csrc/offline-whisper-model.h"
 
 #include <algorithm>
+#include <cmath>
 #include <string>
 #include <tuple>
 #include <unordered_map>