diff --git a/Cantera/src/logger.h b/Cantera/src/logger.h
index 755a96278..b992a47f0 100644
--- a/Cantera/src/logger.h
+++ b/Cantera/src/logger.h
@@ -58,7 +58,7 @@ namespace Cantera {
         /// and reimplement this method.
         virtual void error(const std::string& msg) {
             std::cerr << msg << std::endl;
-            exit(-1);
+            std::exit(-1);
         }
 
         /// Return an integer specifying the application environment.
diff --git a/Cantera/src/stringUtils.h b/Cantera/src/stringUtils.h
index 3aa6fab84..4a17be363 100755
--- a/Cantera/src/stringUtils.h
+++ b/Cantera/src/stringUtils.h
@@ -31,11 +31,11 @@ namespace Cantera {
     std::string getFileName(const std::string& path);
 
     inline int intValue(std::string val) {
-        return atoi(stripws(val).c_str());
+        return std::atoi(stripws(val).c_str());
     }
 
     inline doublereal fpValue(std::string val) {
-        return atof(stripws(val).c_str());
+        return std::atof(stripws(val).c_str());
     }
     std::string wrapString(const std::string& s, int len=70);