diff --git a/modules/omp.cmake b/modules/omp.cmake
index 6c2f432..6582608 100644
--- a/modules/omp.cmake
+++ b/modules/omp.cmake
@@ -24,7 +24,7 @@ if(ENABLE_OPENMP)
     find_package(OpenMP)
     if(OPENMP_FOUND)
         if(DEFINED CMAKE_Fortran_COMPILER_ID)
-            set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${OpenMP_C_FLAGS}")
+            set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} ${OpenMP_Fortran_FLAGS}")
         endif()
         if(DEFINED CMAKE_C_COMPILER_ID)
             set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")