diff --git a/MNH/shuman.f90 b/MNH/shuman.f90
index a9e8c285bf4ec46df14e29709c2c8a1106c5712a..562d6b07d9656b2fbfc85d6344a3b3b9f10ff9dc 100644
--- a/MNH/shuman.f90
+++ b/MNH/shuman.f90
@@ -662,10 +662,10 @@ IKU = SIZE(PA,3)
 !!$END DO
 
 
-!$acc region 
+! acc region 
 PMZM(:,:,2:IKU) = 0.5*( PA(:,:,2:IKU)+PA(:,:,1:IKU-1) )
 PMZM(:,:,1)    = -999.
-!$acc end region
+! acc end region
 !
 !-------------------------------------------------------------------------------
 !