diff --git a/platform/legacy/Cantera_legacy.h b/platform/legacy/Cantera_legacy.h
index fd7808863..561558a46 100644
--- a/platform/legacy/Cantera_legacy.h
+++ b/platform/legacy/Cantera_legacy.h
@@ -11,10 +11,6 @@
 #define CANTERA_APP
 #endif
 
-namespace Cantera_CXX{ }
-
-using namespace Cantera_CXX;
-
 #include "kernel/ct_defs.h"
 
 // some useful functions
diff --git a/test_problems/PecosTransport/PecosTransport.cpp b/test_problems/PecosTransport/PecosTransport.cpp
index 3040dd218..02f58e141 100644
--- a/test_problems/PecosTransport/PecosTransport.cpp
+++ b/test_problems/PecosTransport/PecosTransport.cpp
@@ -42,7 +42,6 @@ using namespace std;
 //#include "TransportFactory.h"
 
 using namespace Cantera;
-//using namespace Cantera_CXX;
 
 void printDbl(double val) {
   if (fabs(val) < 5.0E-17) {
diff --git a/test_problems/statmech/statmech_properties.cpp b/test_problems/statmech/statmech_properties.cpp
index 41459338c..2bd98c3d0 100644
--- a/test_problems/statmech/statmech_properties.cpp
+++ b/test_problems/statmech/statmech_properties.cpp
@@ -26,7 +26,6 @@ using namespace std;
 #include "TransportFactory.h"
 
 using namespace Cantera;
-using namespace Cantera_CXX;
 
 int main(int argc, char** argv) 
 {
diff --git a/test_problems/statmech/statmech_test.cpp b/test_problems/statmech/statmech_test.cpp
index 516a95a20..0cf479d5e 100644
--- a/test_problems/statmech/statmech_test.cpp
+++ b/test_problems/statmech/statmech_test.cpp
@@ -26,7 +26,6 @@
 
 using namespace std;
 using namespace Cantera;
-//using namespace Cantera_CXX;
 
 int main(int argc, char** argv) 
 {