diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index afae18745f..02352230a6 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -141,7 +141,7 @@ endif()
 
 # silence nvcc warnings
 if((PKG_KOKKOS) AND (Kokkos_ENABLE_CUDA) AND NOT (CMAKE_CXX_COMPILER_ID STREQUAL "Clang"))
-  set(CMAKE_TUNE_DEFAULT "${CMAKE_TUNE_DEFAULT} -Xcudafe --diag_suppress=unrecognized_pragma -Xcudafe --diag_suppress=128")
+  set(CMAKE_TUNE_DEFAULT "${CMAKE_TUNE_DEFAULT} -Xcudafe --diag_suppress=unrecognized_pragma -Xcudafe -diag_suppress=128")
 endif()
 
 # we require C++11 without extensions. Kokkos requires at least C++17 (currently)