diff --git a/dune/istl/test/CMakeLists.txt b/dune/istl/test/CMakeLists.txt
index 2833842691435e0d7d386e6b151f568c2e9f7705..c486248367798657b0c6ee2fbb381d9450cd78e4 100644
--- a/dune/istl/test/CMakeLists.txt
+++ b/dune/istl/test/CMakeLists.txt
@@ -133,7 +133,7 @@ dune_add_test(SOURCES spqrtest.cc
               CMAKE_GUARD SuiteSparse_SPQR_FOUND)
 
 dune_add_test(SOURCES overlappingschwarztest.cc
-              CMAKE_GUARD SUPERLU_FOUND OR SuiteSparse_UMFPACK_FOUND)
+              CMAKE_GUARD "SUPERLU_FOUND OR SuiteSparse_UMFPACK_FOUND")
 
 dune_add_test(SOURCES cholmodtest.cc
               CMAKE_GUARD SuiteSparse_CHOLMOD_FOUND)