diff --git a/model/fv_grid_utils.F90 b/model/fv_grid_utils.F90
index 99f8269e8..8eceae59e 100644
--- a/model/fv_grid_utils.F90
+++ b/model/fv_grid_utils.F90
@@ -42,12 +42,12 @@ module fv_grid_utils_mod
  implicit none
  private
  logical:: symm_grid
-#ifdef NO_QUAD_PRECISION
-! 64-bit precision (kind=8)
- integer, parameter:: f_p = selected_real_kind(15)
-#else
+#ifdef ENABLE_QUAD_PRECISION
 ! Higher precision (kind=16) for grid geometrical factors:
  integer, parameter:: f_p = selected_real_kind(20)
+#else
+! 64-bit precision (kind=8)
+ integer, parameter:: f_p = selected_real_kind(15)
 #endif
  real, parameter::  big_number=1.d8
  real, parameter:: tiny_number=1.d-8