diff --git a/sorc/ncep_post.fd/CALPW.f b/sorc/ncep_post.fd/CALPW.f
index e23ba2bf5..2ed406358 100644
--- a/sorc/ncep_post.fd/CALPW.f
+++ b/sorc/ncep_post.fd/CALPW.f
@@ -290,7 +290,7 @@ SUBROUTINE CALPW(PW,IDECID)
           DO I=1,IM
              DP      = PINT(I,J,L+1) - PINT(I,J,L)
              PW(I,J) = PW(I,J) + Qdum(I,J)*DP*GI*HTM(I,J,L)
-            IF (IDECID == 17 .or. IDECID == 21) THEN
+            IF (IDECID == 17 .or. IDECID == 20 .or. IDECID == 21) THEN
              PW(I,J) = PW(I,J) + Qdum(I,J)*MAX(DP,0.)*GI*HTM(I,J,L)
             ENDIF
             IF (IDECID == 19) THEN