diff --git a/src/MNH/hypgeo.f90 b/src/MNH/hypgeo.f90
index d147afd53da655f192d956bc19c99bfe487be378..fa64d778da5ee68c7483f3a2ce969f7dda5269fe 100644
--- a/src/MNH/hypgeo.f90
+++ b/src/MNH/hypgeo.f90
@@ -74,6 +74,7 @@ END MODULE MODI_HYPGEO
 !
 !
 USE MODI_GAMMA
+USE MODI_HYPSER
 !
 IMPLICIT NONE
 !