diff --git a/src/MNH/ion_drift.f90 b/src/MNH/ion_drift.f90
index 350ae4a59a6e605f622fac43b2441a2040e1fb49..040bcd97136b5aa88b1e515a32cebb6ec8ec466c 100644
--- a/src/MNH/ion_drift.f90
+++ b/src/MNH/ion_drift.f90
@@ -61,6 +61,7 @@ USE MODE_ELEC_ll
 USE MODI_SHUMAN
 USE MODI_CONTRAV
 USE MODI_PPM_SCALAR
+USE MODI_PPM_RHODJ 
 USE MODI_GDIV
 USE MODI_ION_BOUND4DRIFT
 !