diff --git a/src/INTERLAYER/pair_ilp_graphene_hbn.cpp b/src/INTERLAYER/pair_ilp_graphene_hbn.cpp
index efb7214cd7..3aa5ae7bf5 100644
--- a/src/INTERLAYER/pair_ilp_graphene_hbn.cpp
+++ b/src/INTERLAYER/pair_ilp_graphene_hbn.cpp
@@ -107,6 +107,7 @@ PairILPGrapheneHBN::~PairILPGrapheneHBN()
 
   memory->destroy(elem2param);
   memory->destroy(cutILPsq);
+  memory->sfree(params);
 }
 
 /* ----------------------------------------------------------------------