diff --git a/src/KSPACE/pppm.cpp b/src/KSPACE/pppm.cpp
index 80328a2d6fbc6796b62873acf003124b98d6efad..232cabe4ea9bed54f8463058bd5f78cefee89b72 100644
--- a/src/KSPACE/pppm.cpp
+++ b/src/KSPACE/pppm.cpp
@@ -82,6 +82,7 @@ PPPM::PPPM(LAMMPS *lmp, int narg, char **arg) : KSpace(lmp, narg, arg),
 
   pppmflag = 1;
   group_group_enable = 1;
+  triclinic = domain->triclinic;
 
   accuracy_relative = fabs(force->numeric(FLERR,arg[0]));