diff --git a/src/fields/fft_poisson_solver/FFTPoissonSolverPeriodic.cpp b/src/fields/fft_poisson_solver/FFTPoissonSolverPeriodic.cpp
index 54045693c4..863a41427a 100644
--- a/src/fields/fft_poisson_solver/FFTPoissonSolverPeriodic.cpp
+++ b/src/fields/fft_poisson_solver/FFTPoissonSolverPeriodic.cpp
@@ -128,7 +128,7 @@ FFTPoissonSolverPeriodic::SolvePoissonEquation (amrex::MultiFab& lhs_mf)
 #ifdef AMREX_USE_OMP
 #pragma omp parallel if (amrex::Gpu::notInLaunchRegion())
 #endif
-    for ( amrex::MFIter mfi(m_stagingArea, DfltMfiTlng); mfi.isValid(); ++mfi ){
+    for ( amrex::MFIter mfi(m_tmpSpectralField, DfltMfiTlng); mfi.isValid(); ++mfi ){
         // Solve Poisson equation in Fourier space:
         // Multiply `tmpSpectralField` by inv_k2
         Array2<amrex::GpuComplex<amrex::Real>> tmp_cmplx_arr = m_tmpSpectralField.array(mfi);