diff --git a/src/resonanceReconstruction/rmatrix/test/CMakeLists.txt b/src/resonanceReconstruction/rmatrix/test/CMakeLists.txt
index 910e17a..c8b41c6 100644
--- a/src/resonanceReconstruction/rmatrix/test/CMakeLists.txt
+++ b/src/resonanceReconstruction/rmatrix/test/CMakeLists.txt
@@ -1,3 +1 @@
-add_executable( resonanceReconstruction.rmatrix.test rmatrix.test.cpp )
-target_link_libraries( resonanceReconstruction.rmatrix.test PUBLIC resonanceReconstruction )
-add_test( NAME resonanceReconstruction.rmatrix COMMAND resonanceReconstruction.rmatrix.test )
+add_cpp_test( rmatrix rmatrix.test.cpp )
diff --git a/src/resonanceReconstruction/rmatrix/test/rmatrix.test.cpp b/src/resonanceReconstruction/rmatrix/test/rmatrix.test.cpp
index 73f109f..958cca4 100644
--- a/src/resonanceReconstruction/rmatrix/test/rmatrix.test.cpp
+++ b/src/resonanceReconstruction/rmatrix/test/rmatrix.test.cpp
@@ -1,6 +1,9 @@
-#define CATCH_CONFIG_MAIN
+// include Catch2
+#include <catch2/catch_test_macros.hpp>
+#include <catch2/catch_approx.hpp>
+using Catch::Approx;
 
-#include "catch.hpp"
+// what we are testing
 #include "resonanceReconstruction/rmatrix.hpp"
 
 using namespace njoy::resonanceReconstruction;