diff --git a/test_problems/min_python/negATest/negATest.cpp b/test_problems/min_python/negATest/negATest.cpp
index 9e253fb74..bf79f816b 100644
--- a/test_problems/min_python/negATest/negATest.cpp
+++ b/test_problems/min_python/negATest/negATest.cpp
@@ -24,6 +24,7 @@
 #endif
 
 using namespace Cantera;
+using namespace std;
 
 #
 int main(int argc, char **argv) {