diff --git a/CMakeLists.txt b/CMakeLists.txt
index ae15e8b..bf3f61d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -113,6 +113,7 @@ if(WERROR)
    # This flag seems to be needed for temp variables generated by the compiler version in jammy
    set_source_files_properties(src/shr_assert_mod.F90 PROPERTIES COMPILE_OPTIONS "-Wno-error=maybe-uninitialized")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror -Wno-error=cpp")
+   set_source_files_properties(src/shr_cal_mod.F90 PROPERTIES COMPILE_OPTIONS "-Wno-error=conversion")
    
 endif()
 add_dependencies (share genf90)