diff --git a/src/tests/catch_test_multifluid.cxx b/src/tests/catch_test_multifluid.cxx
index 9113d36436964c2b394b403adae921c3fe8805d1..f4b4b44384e01e8386f568b6313981a9ec097c01 100644
--- a/src/tests/catch_test_multifluid.cxx
+++ b/src/tests/catch_test_multifluid.cxx
@@ -18,7 +18,7 @@ TEST_CASE("Trace critical locus for nitrogen + ethane", "[crit],[multifluid]")
         Eigen::ArrayXd rhovec0(2); rhovec0 = 0.0; rhovec0[ifluid] = 1.0 / model.redfunc.vc[ifluid];
 
         auto tic0 = std::chrono::steady_clock::now();
-        std::string filename = "h";
+        std::string filename = "";
         using ct = CriticalTracing<decltype(model), double, Eigen::ArrayXd>;
         TCABOptions opt; opt.init_dt = 100; opt.integration_order = 1;
         auto j = ct::trace_critical_arclength_binary(model, T0, rhovec0, filename, opt);
@@ -31,7 +31,7 @@ TEST_CASE("Trace critical locus for nitrogen + ethane", "[crit],[multifluid]")
         Eigen::ArrayXd rhovec0(2); rhovec0 = 0.0; rhovec0[ifluid] = 1.0 / model.redfunc.vc[ifluid];
 
         auto tic0 = std::chrono::steady_clock::now();
-        std::string filename = "h";
+        std::string filename = "";
         using ct = CriticalTracing<decltype(model), double, Eigen::ArrayXd>;
         TCABOptions opt; opt.max_dt = 10000; opt.init_dt = 10; opt.abs_err = 1e-8; opt.rel_err = 1e-6; opt.small_T_count = 100;
         auto j = ct::trace_critical_arclength_binary(model, T0, rhovec0, filename, opt);