diff --git a/unittests/Kokkos/CMakeLists.txt b/unittests/Kokkos/CMakeLists.txt
index 95f826bb0..be0250cf1 100644
--- a/unittests/Kokkos/CMakeLists.txt
+++ b/unittests/Kokkos/CMakeLists.txt
@@ -3,5 +3,14 @@ add_clad_unittest(KokkosTests
   main.cpp
   )
 
+# If llvm does not require rtti, kokkos does.
+if (NOT (LLVM_REQUIRES_RTTI OR LLVM_ENABLE_RTTI))
+  if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
+    target_compile_options(KokkosTests PUBLIC -frtti)
+  elseif(MSVC)
+    target_compile_options(KokkosTests PUBLIC /GR)
+  endif()
+endif()
+
 target_link_libraries(KokkosTests PUBLIC ${Kokkos_LIBRARIES})
 target_include_directories(KokkosTests SYSTEM PRIVATE ${Kokkos_INCLUDE_DIRS})