diff --git a/tools/external_sst.F90 b/tools/external_sst.F90
index d67f62391..c1472c3a0 100644
--- a/tools/external_sst.F90
+++ b/tools/external_sst.F90
@@ -21,17 +21,9 @@
 
 module external_sst_mod
 
-#ifdef NO_GFDL_SHARED
-!----------------- Public Data -----------------------------------
-integer :: i_sst = -1
-integer :: j_sst = -1
-logical :: forecast_mode = .false.
-logical :: use_ncep_sst  = .false.
+use amip_interp_mod, only: i_sst, j_sst, forecast_mode, use_ncep_sst
+
 real, allocatable, dimension(:,:) ::  sst_ncep, sst_anom
-#else
-use amip_interp_mod, only: i_sst, j_sst, sst_ncep, sst_anom, &
-                           forecast_mode, use_ncep_sst
-#endif
 
 public i_sst, j_sst, sst_ncep, sst_anom, forecast_mode, use_ncep_sst