diff --git a/mace/core/runtime/cpu/cpu_runtime.cc b/mace/core/runtime/cpu/cpu_runtime.cc
index 67215b8dd430ff05d013f2d71c4e6fc7f1533d7e..f9baac6e6cf528e3bf58f779ead99ab8bca18db0 100644
--- a/mace/core/runtime/cpu/cpu_runtime.cc
+++ b/mace/core/runtime/cpu/cpu_runtime.cc
@@ -84,7 +84,7 @@ int GetCPUMaxFreq(std::vector<float> *max_freqs) {
     }
     std::string line;
     if (std::getline(f, line)) {
-      float freq = atof(line.c_str());
+      float freq = strtof(line.c_str(), nullptr);
       max_freqs->push_back(freq);
     }
     if (f.bad()) {