diff --git a/Cantera/cxx/demos/NASA_coeffs/NASA_coeffs.cpp b/Cantera/cxx/demos/NASA_coeffs/NASA_coeffs.cpp
index 913e9e362..d8efa570b 100644
--- a/Cantera/cxx/demos/NASA_coeffs/NASA_coeffs.cpp
+++ b/Cantera/cxx/demos/NASA_coeffs/NASA_coeffs.cpp
@@ -12,6 +12,7 @@
 
 using namespace std; 
 using namespace Cantera;
+using namespace Cantera_CXX;
 
 
 // The program is put into a function so that error handling code can