diff --git a/tools/fv_diagnostics.F90 b/tools/fv_diagnostics.F90
index 2acbc0588..859fb0dbe 100644
--- a/tools/fv_diagnostics.F90
+++ b/tools/fv_diagnostics.F90
@@ -113,11 +113,12 @@ module fv_diagnostics_mod
 ! </table>
 
 #ifdef OVERLOAD_R4
- use constantsR4_mod,      only: grav, rdgas, rvgas, pi=>pi_8, radius, kappa, WTMAIR, WTMCO2, &
+ use constantsR4_mod,    only: grav, rdgas, rvgas, pi=>pi_8, radius, kappa, WTMAIR, WTMCO2, &
+                               omega, hlv, cp_air, cp_vapor, TFREEZE
 #else
  use constants_mod,      only: grav, rdgas, rvgas, pi=>pi_8, radius, kappa, WTMAIR, WTMCO2, &
-#endif
                                omega, hlv, cp_air, cp_vapor, TFREEZE
+#endif
  use fms_mod,            only: write_version_number
  use time_manager_mod,   only: time_type, get_date, get_time
  use mpp_domains_mod,    only: domain2d, mpp_update_domains, DGRID_NE, NORTH, EAST