diff --git a/cpp/switchchain_timeevol.cpp b/cpp/switchchain_timeevol.cpp
index 37f77c5fbd7808a43d60b7b08beec63ac35e5e9b..a69b23d9008771c33259ce7be0ba2cef391cd807 100644
--- a/cpp/switchchain_timeevol.cpp
+++ b/cpp/switchchain_timeevol.cpp
@@ -216,7 +216,7 @@ int main(int argc, char* argv[]) {
     if (argc >= 2)
         outfile.open(argv[1]);
     else   
-        outfile.open("graphdata_mixingtime.m");
+        outfile.open("graphdata_timeevol.m");
 
     if (!outfile.is_open()) {
         std::cout << "ERROR: Could not open output file.\n";