diff --git a/src/stepon.F90 b/src/stepon.F90
index 321d853f2be2cf3c754041a0b7174726514dd08b..16a25bbd55534fdf5b2f611bce735babad20d397 100644
--- a/src/stepon.F90
+++ b/src/stepon.F90
@@ -115,7 +115,7 @@ CONTAINS
       LOGICAL :: checkf_
       REAL    :: sum_
       !! Maybe useless
-      ! IF(LINEARITY .NE. 'linear') CALL anti_aliasing   ! ensure 0 mode for 2/3 rule
+      IF(LINEARITY .NE. 'linear') CALL anti_aliasing   ! ensure 0 mode for 2/3 rule
       ! IF(LINEARITY .NE. 'linear') CALL enforce_symmetry ! Enforcing symmetry on kx = 0
 
       mlend=.FALSE.