diff --git a/test/unit/fortran/CMakeLists.txt b/test/unit/fortran/CMakeLists.txt
index cf108b67..965f1581 100644
--- a/test/unit/fortran/CMakeLists.txt
+++ b/test/unit/fortran/CMakeLists.txt
@@ -14,8 +14,7 @@ endif()
 
 # Overwrite the init flags chosen by CMake
 if(${CMAKE_Fortran_COMPILER_ID} MATCHES "GNU")
-  message("Adding free line length to command line.")
-  set(CMAKE_Fortran_FLAGS_INIT "-ffree-line-length-none")
+  add_compile_options("-ffree-line-length-none")
 endif()
 
 if(CAM_SIMA_ENABLE_CODE_COVERAGE)