diff --git a/test_problems/CpJump/CpJump.cpp b/test_problems/CpJump/CpJump.cpp
index 08e1ed334..dd5205d2a 100644
--- a/test_problems/CpJump/CpJump.cpp
+++ b/test_problems/CpJump/CpJump.cpp
@@ -20,6 +20,7 @@
 
 using namespace std;
 using namespace Cantera;
+using namespace Cantera_CXX;
 
 int main(int argc, char **argv) {
   try {