diff --git a/Processes/CONEXSourceCut/testCONEXSourceCut.cc b/Processes/CONEXSourceCut/testCONEXSourceCut.cc
index a34452493ffc4427943ca83a0e229ea4b24112e6..1fcb0e5e96dfe7c3bc55da91e4a17d3c543b83ca 100644
--- a/Processes/CONEXSourceCut/testCONEXSourceCut.cc
+++ b/Processes/CONEXSourceCut/testCONEXSourceCut.cc
@@ -26,6 +26,7 @@ using namespace corsika::geometry;
 using namespace corsika::units::si;
 
 TEST_CASE("CONEXSourceCut") {
+  random::RNGManager::GetInstance().RegisterRandomStream("cascade");
   // setup environment, geometry
   using EnvType = Environment<setup::IEnvironmentModel>;
   EnvType env;