diff --git a/Regression/Checksum/benchmarks_json/test_3d_open_bc_poisson_solver.json b/Regression/Checksum/benchmarks_json/test_3d_open_bc_poisson_solver.json
index 0ca6bde570a..af9ab3a0bdd 100644
--- a/Regression/Checksum/benchmarks_json/test_3d_open_bc_poisson_solver.json
+++ b/Regression/Checksum/benchmarks_json/test_3d_open_bc_poisson_solver.json
@@ -1,20 +1,20 @@
 {
   "lev=0": {
-    "Bx": 100915975.15403552,
-    "By": 157610677.3147734,
-    "Bz": 1.2276713711194638e-13,
-    "Ex": 4.725066923359797e+16,
-    "Ey": 3.025396149317578e+16,
-    "Ez": 3276584.4383433824,
-    "rho": 10994013582437.197
+    "Bx": 100915933.446046,
+    "By": 157610622.18548763,
+    "Bz": 2.76973993530483e-13,
+    "Ex": 4.725065270619211e+16,
+    "Ey": 3.0253948989388292e+16,
+    "Ez": 3276573.9514776673,
+    "rho": 10994013582437.193
   },
   "electron": {
-    "particle_momentum_x": 5.701279599509506e-19,
-    "particle_momentum_y": 3.650453172383178e-19,
+    "particle_momentum_x": 5.701277606055763e-19,
+    "particle_momentum_y": 3.6504516636842883e-19,
     "particle_momentum_z": 1.145432768297242e-10,
-    "particle_position_x": 17.31408691249785,
-    "particle_position_y": 0.25836912671878015,
+    "particle_position_x": 17.314086912497864,
+    "particle_position_y": 0.25836912671877965,
     "particle_position_z": 10066.329600000008,
     "particle_weight": 19969036501.910976
   }
-}
\ No newline at end of file
+}
diff --git a/Source/ablastr/fields/IntegratedGreenFunctionSolver.cpp b/Source/ablastr/fields/IntegratedGreenFunctionSolver.cpp
index ae11ad5087d..40b36740ae5 100644
--- a/Source/ablastr/fields/IntegratedGreenFunctionSolver.cpp
+++ b/Source/ablastr/fields/IntegratedGreenFunctionSolver.cpp
@@ -121,7 +121,7 @@ computePhiIGF ( amrex::MultiFab const & rho,
 
     BL_PROFILE_VAR_START(timer_pcopies);
     // Copy from rho including its ghost cells to tmp_rho
-    tmp_rho.ParallelCopy( rho, 0, 0, 1, rho.nGrowVect(), amrex::IntVect::TheZeroVector() );
+    tmp_rho.ParallelCopy( rho, 0, 0, 1, amrex::IntVect::TheZeroVector(), amrex::IntVect::TheZeroVector() );
     BL_PROFILE_VAR_STOP(timer_pcopies);
 
 #if !defined(ABLASTR_USE_HEFFTE)