diff --git a/Modules/Compiler/LLVMFlang-Fortran.cmake b/Modules/Compiler/LLVMFlang-Fortran.cmake
index 9e72b06893..291413edeb 100644
--- a/Modules/Compiler/LLVMFlang-Fortran.cmake
+++ b/Modules/Compiler/LLVMFlang-Fortran.cmake
@@ -14,3 +14,7 @@ set(CMAKE_Fortran_MODDIR_FLAG "-module-dir")
 set(CMAKE_Fortran_COMPILE_OPTIONS_PREPROCESS_ON "-cpp")
 set(CMAKE_Fortran_COMPILE_OPTIONS_PREPROCESS_OFF "-nocpp")
 set(CMAKE_Fortran_POSTPROCESS_FLAG "-ffixed-line-length-72")
+
+string(APPEND CMAKE_Fortran_FLAGS_DEBUG_INIT " -O0 -g")
+string(APPEND CMAKE_Fortran_FLAGS_RELWITHDEBINFO_INIT " -O2 -g")
+string(APPEND CMAKE_Fortran_FLAGS_RELEASE_INIT " -O3")