diff --git a/Cantera/src/thermo/WaterPropsIAPWSphi.cpp b/Cantera/src/thermo/WaterPropsIAPWSphi.cpp
index 5dde4a863..4263ed0ae 100644
--- a/Cantera/src/thermo/WaterPropsIAPWSphi.cpp
+++ b/Cantera/src/thermo/WaterPropsIAPWSphi.cpp
@@ -14,8 +14,15 @@
 
 #include "WaterPropsIAPWSphi.h"
 
-#include <cmath>
 #include <cstdio>
+#include <cmath>
+
+using std::printf;
+using std::sqrt;
+using std::log;
+using std::exp;
+using std::pow;
+using std::fabs;
 
 /*
  * Critical Point values in mks units: Note, these aren't used in this 
@@ -390,8 +397,8 @@ void WaterPropsIAPWSphi::intCheck(double tau, double delta) {
   double res_dt = phiR_dt();
   double nau_dt = phi0_dt();
 
-  printf("nau    = %20.12e\t\tres    = %20.12e\n", nau,    res);
-  printf("nau_d  = %20.12e\t\tres_d  = %20.12e\n", nau_d,  res_d);
+  std::printf("nau    = %20.12e\t\tres    = %20.12e\n", nau,    res);
+  std::printf("nau_d  = %20.12e\t\tres_d  = %20.12e\n", nau_d,  res_d);
   printf("nau_dd = %20.12e\t\tres_dd = %20.12e\n", nau_dd, res_dd);
   printf("nau_t  = %20.12e\t\tres_t  = %20.12e\n", nau_t,  res_t);
   printf("nau_tt = %20.12e\t\tres_tt = %20.12e\n", nau_tt, res_tt);