diff --git a/tests/modules/testFluka.cpp b/tests/modules/testFluka.cpp
index a26b36f493952e10d2c27465b5b0b9011636cbd9..1978c3f0478c365f682b75b7d0f035dc6745f23b 100644
--- a/tests/modules/testFluka.cpp
+++ b/tests/modules/testFluka.cpp
@@ -42,6 +42,8 @@ TEST_CASE("FLUKACodeConversion") {
   REQUIRE(corsika::fluka::convertToFlukaRaw(Code::PiPlus) == 13);
   REQUIRE(corsika::fluka::convertToFlukaRaw(Code::Proton) == 1);
   REQUIRE(corsika::fluka::convertToFlukaRaw(Code::Lambda0) == 17);
+
+  REQUIRE_THROWS(corsika::fluka::convertToFluka(Code::WPlus));
 }
 
 auto setupEnvironment() {