diff --git a/model/src/ww3_outp.F90 b/model/src/ww3_outp.F90
index 54c3fc130..8313f3516 100644
--- a/model/src/ww3_outp.F90
+++ b/model/src/ww3_outp.F90
@@ -210,7 +210,9 @@ PROGRAM W3OUTP
   USE W3IOGRMD, ONLY: W3IOGR
   !!!MTM
   !!! USE W3IOPOMD, ONLY: W3IOPO
-  USE W3IOPOMD, ONLY: W3IOPO, W3IOPON
+  USE W3IOPOMD, ONLY: W3IOPO, W3IOPON, W3IOPON_READ, W3IOPON_WRITE
+  USE netcdf
+  !!!MTM
   USE W3SERVMD, ONLY : ITRACE, NEXTLN, EXTCDE
 #ifdef W3_S
   USE W3SERVMD, ONLY : STRACE