diff --git a/include/cantera/base/utilities.h b/include/cantera/base/utilities.h
index 8c3d6da24..a7486e540 100644
--- a/include/cantera/base/utilities.h
+++ b/include/cantera/base/utilities.h
@@ -107,7 +107,7 @@ template<class InputIter, class InputIter2>
 inline doublereal dot(InputIter x_begin, InputIter x_end,
                       InputIter2 y_begin)
 {
-    return inner_product(x_begin, x_end, y_begin, 0.0);
+    return std::inner_product(x_begin, x_end, y_begin, 0.0);
 }
 
 //! Multiply elements of an array by a scale factor.
@@ -234,7 +234,7 @@ template<class InputIter, class OutputIter>
 inline void normalize(InputIter begin, InputIter end,
                       OutputIter out)
 {
-    doublereal sum = accumulate(begin, end, 0.0);
+    doublereal sum = std::accumulate(begin, end, 0.0);
     for (; begin != end; ++begin, ++out) {
         *out = *begin/sum;
     }