diff --git a/unittest/fortran/CMakeLists.txt b/unittest/fortran/CMakeLists.txt
index 1062766e43..c7174d8e6e 100644
--- a/unittest/fortran/CMakeLists.txt
+++ b/unittest/fortran/CMakeLists.txt
@@ -23,6 +23,10 @@ if(CMAKE_Fortran_COMPILER)
     endif()
   else()
     add_library(fmpi_stubs STATIC mpi_stubs.f90)
+    get_filename_component(_tmp_fc ${CMAKE_Fortran_COMPILER} NAME)
+    if (_tmp_fc STREQUAL "flang")
+      target_link_libraries(fmpi_stubs PUBLIC gfortran)
+    endif()
     add_library(MPI::MPI_Fortran ALIAS fmpi_stubs)
   endif()