diff --git a/src/USER-MISC/pair_ilp_graphene_hbn.cpp b/src/USER-MISC/pair_ilp_graphene_hbn.cpp
index 0f0b8fa78f..a41c660b7b 100644
--- a/src/USER-MISC/pair_ilp_graphene_hbn.cpp
+++ b/src/USER-MISC/pair_ilp_graphene_hbn.cpp
@@ -47,6 +47,7 @@ using namespace LAMMPS_NS;
 PairILPGrapheneHBN::PairILPGrapheneHBN(LAMMPS *lmp) : Pair(lmp)
 {
   restartinfo = 0;
+  one_coeff = 1;
 
   // initialize element to parameter maps
   nelements = 0;
diff --git a/src/USER-MISC/pair_kolmogorov_crespi_full.cpp b/src/USER-MISC/pair_kolmogorov_crespi_full.cpp
index ee7071b1c7..e73278968d 100644
--- a/src/USER-MISC/pair_kolmogorov_crespi_full.cpp
+++ b/src/USER-MISC/pair_kolmogorov_crespi_full.cpp
@@ -47,6 +47,7 @@ using namespace LAMMPS_NS;
 PairKolmogorovCrespiFull::PairKolmogorovCrespiFull(LAMMPS *lmp) : Pair(lmp)
 {
   restartinfo = 0;
+  one_coeff = 1;
 
   // initialize element to parameter maps
   nelements = 0;