diff --git a/operators/CMakeLists.txt b/operators/CMakeLists.txt
index a3ade657b1d10b9d6cf0cc17781bf8980c989600..2dfec301ba1a82f3b62a2b24dfa7b4b29825626e 100644
--- a/operators/CMakeLists.txt
+++ b/operators/CMakeLists.txt
@@ -5,6 +5,8 @@ if(NOT WALBERLA_DOUBLE_ACCURACY)
    add_compile_options( "-Wno-implicit-float-conversion" )
 endif()
 
+add_compile_options( "-Wno-unused-variable" )
+
 add_subdirectory(curl_curl)
 add_subdirectory(diffusion)
 add_subdirectory(div_k_grad)