diff --git a/src/KSPACE/pppm.cpp b/src/KSPACE/pppm.cpp
index 05169fca1c05d808e2ff1ea05ff1fb9508be4445..6add8b58b74dcf5a35ed1fd6cb1b8b75dda329d7 100644
--- a/src/KSPACE/pppm.cpp
+++ b/src/KSPACE/pppm.cpp
@@ -95,6 +95,11 @@ PPPM::PPPM(LAMMPS *lmp, int narg, char **arg) : KSpace(lmp, narg, arg),
   MPI_Comm_rank(world,&me);
   MPI_Comm_size(world,&nprocs);
 
+  nfft_both = 0;
+  nxhi_in = nxlo_in = nxhi_out = nxlo_out = 0;
+  nyhi_in = nylo_in = nyhi_out = nylo_out = 0;
+  nzhi_in = nzlo_in = nzhi_out = nzlo_out = 0;
+
   density_brick = vdx_brick = vdy_brick = vdz_brick = NULL;
   density_fft = NULL;
   u_brick = NULL;
diff --git a/src/KSPACE/pppm_disp.cpp b/src/KSPACE/pppm_disp.cpp
index b31d42a815e2b66760ebbee2df44c0cfdee474e4..43b2c8236aada45acf58f1ac75aa9dcb5ff8b478 100644
--- a/src/KSPACE/pppm_disp.cpp
+++ b/src/KSPACE/pppm_disp.cpp
@@ -121,6 +121,13 @@ PPPMDisp::PPPMDisp(LAMMPS *lmp, int narg, char **arg) : KSpace(lmp, narg, arg),
 
   MPI_Comm_rank(world,&me);
   MPI_Comm_size(world,&nprocs);
+  nfft_both = nfft_both_6 = 0;
+  nxhi_in = nxlo_in = nxhi_out = nxlo_out = 0;
+  nyhi_in = nylo_in = nyhi_out = nylo_out = 0;
+  nzhi_in = nzlo_in = nzhi_out = nzlo_out = 0;
+  nxhi_in_6 = nxlo_in_6 = nxhi_out_6 = nxlo_out_6 = 0;
+  nyhi_in_6 = nylo_in_6 = nyhi_out_6 = nylo_out_6 = 0;
+  nzhi_in_6 = nzlo_in_6 = nzhi_out_6 = nzlo_out_6 = 0;
 
   csumflag = 0;
   B = NULL;