diff --git a/src/modules/moduleBoundary.f90 b/src/modules/moduleBoundary.f90
index 0b76105..b5bda2f 100644
--- a/src/modules/moduleBoundary.f90
+++ b/src/modules/moduleBoundary.f90
@@ -126,7 +126,7 @@ MODULE moduleBoundary
       SELECT TYPE(boundary)
       TYPE IS(boundaryIonization)
         boundary%m0 = m0 / m_ref
-        boundary%n0 = n0 * Vol_ref
+        boundary%n0 = n0 / n_ref
         boundary%v0 = v0 / v_ref
         boundary%vTh = DSQRT(kb*T0/m0)/v_ref
         boundary%species => species(ion)%obj