1 files changed, 2 insertions, 1 deletions
diff --git a/Source/FieldSolver/SpectralSolver/SpectralFieldData.H b/Source/FieldSolver/SpectralSolver/SpectralFieldData.H
index 4999a268d..e7764627b 100644
--- a/Source/FieldSolver/SpectralSolver/SpectralFieldData.H
+++ b/Source/FieldSolver/SpectralSolver/SpectralFieldData.H
@@ -85,7 +85,8 @@ class SpectralFieldData
             ForwardTransform(lev, mf, field_index, i_comp, mf.ixType().toIntVect());
         }
 
-        void BackwardTransform (const int lev, amrex::MultiFab& mf, const int field_index, const int i_comp);
+        void BackwardTransform (const int lev, amrex::MultiFab& mf, const int field_index,
+                                const int i_comp, const amrex::IntVect& fill_guards);
 
         // `fields` stores fields in spectral space, as multicomponent FabArray
         SpectralField fields;