diff --git a/json11.cpp b/json11.cpp
index 2dc955a..f0f85a4 100644
--- a/json11.cpp
+++ b/json11.cpp
@@ -536,7 +536,7 @@ struct JsonParser {
                 i++;
         }
 
-        return std::atof(str.c_str() + start_pos);
+        return std::strtod(str.c_str() + start_pos, nullptr);
     }
 
     /* expect(str, res)