diff --git a/appl/conjugateheattransfer/monolithic-const-dt/CMakeLists.txt b/appl/conjugateheattransfer/monolithic-const-dt/CMakeLists.txt
index e9d1012f342b0cf3aba02808433c6858f91e5f5e..95f70e426bca858c1c58fe56e1240052d804bc32 100644
--- a/appl/conjugateheattransfer/monolithic-const-dt/CMakeLists.txt
+++ b/appl/conjugateheattransfer/monolithic-const-dt/CMakeLists.txt
@@ -2,3 +2,4 @@
 dune_symlink_to_source_files(FILES "../monolithic/params.input")
 
 add_executable(test_conjugate_heat_monolithic_const_dt EXCLUDE_FROM_ALL main.cc)
+target_compile_definitions(test_conjugate_heat_monolithic PUBLIC "ENABLEMONOLITHIC=1")