diff --git a/src/PERI/fix_peri_neigh.cpp b/src/PERI/fix_peri_neigh.cpp
index 666a276973..3271e743c8 100644
--- a/src/PERI/fix_peri_neigh.cpp
+++ b/src/PERI/fix_peri_neigh.cpp
@@ -263,8 +263,8 @@ void FixPeriNeigh::setup(int vflag)
   double **x0 = atom->x0;
   double half_lc = 0.5*(domain->lattice->xlattice);
   double vfrac_scale;
-  PairPeriLPS *pairlps = dynamic_cast<PairPeriLPS*>(anypair);
-  PairPeriPMB *pairpmb = dynamic_cast<PairPeriPMB*>(anypair);
+  PairPeriLPS *pairlps = static_cast<PairPeriLPS*>(anypair);
+  PairPeriPMB *pairpmb = static_cast<PairPeriPMB*>(anypair);
   for (i = 0; i < nlocal; i++) {
     double xtmp0 = x0[i][0];
     double ytmp0 = x0[i][1];