diff --git a/src/KSPACE/pair_buck_coul_long.cpp b/src/KSPACE/pair_buck_coul_long.cpp
index a46424baf7..a63047ea9f 100644
--- a/src/KSPACE/pair_buck_coul_long.cpp
+++ b/src/KSPACE/pair_buck_coul_long.cpp
@@ -43,7 +43,17 @@ PairBuckCoulLong::PairBuckCoulLong(LAMMPS *lmp) : Pair(lmp)
 {
   ewaldflag = pppmflag = 1;
   writedata = 1;
-  ftable = NULL;
+  ftable = nullptr;
+  cut_lj = nullptr;
+  cut_ljsq = nullptr;
+  a = nullptr;
+  rho = nullptr;
+  c = nullptr;
+  rhoinv = nullptr;
+  buck1 = nullptr;
+  buck2 = nullptr;
+  offset = nullptr;
+  cut_respa = nullptr;
 }
 
 /* ---------------------------------------------------------------------- */