diff --git a/src/USER-DRUDE/pair_lj_cut_thole_long.cpp b/src/USER-DRUDE/pair_lj_cut_thole_long.cpp
index 9b61bebaf6..f5d5467a9c 100644
--- a/src/USER-DRUDE/pair_lj_cut_thole_long.cpp
+++ b/src/USER-DRUDE/pair_lj_cut_thole_long.cpp
@@ -54,6 +54,7 @@ using namespace MathConst;
 PairLJCutTholeLong::PairLJCutTholeLong(LAMMPS *lmp) : Pair(lmp)
 {
   ewaldflag = pppmflag = 1;
+  single_enable = 0;
   writedata = 1;
   ftable = NULL;
   qdist = 0.0;