diff --git a/src/SURFEX/hvac_autosize.F90 b/src/SURFEX/hvac_autosize.F90
index e26e5953db53d48366c6b5a158b14e4f5aa8d699..73bcc5cbba76873ecccdc5d48f8f9a1bcfb1e8e2 100644
--- a/src/SURFEX/hvac_autosize.F90
+++ b/src/SURFEX/hvac_autosize.F90
@@ -55,13 +55,13 @@ USE YOMHOOK   ,ONLY : LHOOK,   DR_HOOK
 USE PARKIND1  ,ONLY : JPRB
 !
 #ifdef AIX64 
-USE OMP_LIB
+!$ USE OMP_LIB
 #endif
 !
 IMPLICIT NONE
 !
 #ifndef AIX64
-  INCLUDE 'omp_lib.h'
+!$  INCLUDE 'omp_lib.h'
 #endif
 !
 !*    0.1    Declaration of arguments