diff --git a/src/devices/cpu/cpudevice.cpp b/src/devices/cpu/cpudevice.cpp
index c7084fc5..7fb54ca9 100644
--- a/src/devices/cpu/cpudevice.cpp
+++ b/src/devices/cpu/cpudevice.cpp
@@ -16,6 +16,7 @@
 #endif
 
 #include "utils.h"
+#define M_PI       3.14159265358979323846   // pi
 
 namespace fastllm {
     CpuDevice::CpuDevice() {