diff --git a/src/neigh_list.cpp b/src/neigh_list.cpp
index dfdd0f33a889c26cce821973b0335a63883c5dc3..299a8704ba81373611bd737c26da36c01ca6e139 100644
--- a/src/neigh_list.cpp
+++ b/src/neigh_list.cpp
@@ -58,6 +58,8 @@ NeighList::NeighList(LAMMPS *lmp) :
   listskip = NULL;
 
   // USER-DPD package
+
+  ssaflag = 0;
   ndxAIR_ssa = NULL;
   maxbin_ssa = 0;
   bins_ssa = NULL;