diff --git a/tools/templates/f77/demo_ftnlib.cpp b/tools/templates/f77/demo_ftnlib.cpp
index 2baa9bf06..b8e24b86d 100644
--- a/tools/templates/f77/demo_ftnlib.cpp
+++ b/tools/templates/f77/demo_ftnlib.cpp
@@ -37,6 +37,7 @@
 
 using namespace Cantera;
 using namespace Cantera_CXX;
+using namespace std;
 
 // store a pointer to an IdealGasMix object
 static IdealGasMix* _gas = 0;