diff --git a/src/REAXFF/fix_acks2_reaxff.cpp b/src/REAXFF/fix_acks2_reaxff.cpp
index 2692d7eeca..f1edd74d34 100644
--- a/src/REAXFF/fix_acks2_reaxff.cpp
+++ b/src/REAXFF/fix_acks2_reaxff.cpp
@@ -136,7 +136,7 @@ void FixACKS2ReaxFF::pertype_parameters(char *arg)
     eta = (double *) pair->extract("eta",tmp);
     gamma = (double *) pair->extract("gamma",tmp);
     bcut_acks2 = (double *) pair->extract("bcut_acks2",tmp);
-    auto  bond_softness_ptr = (double *) pair->extract("bond_softness",tmp);
+    auto *bond_softness_ptr = (double *) pair->extract("bond_softness",tmp);
 
     if (chi == nullptr || eta == nullptr || gamma == nullptr ||
         bcut_acks2 == nullptr || bond_softness_ptr == nullptr)
@@ -417,7 +417,7 @@ void FixACKS2ReaxFF::compute_X()
   int jnum;
   int i, j, ii, jj, flag;
   double dx, dy, dz, r_sqr;
-  const double SMALL = 0.0001;
+  constexpr double SMALL = 0.0001;
 
   int *type = atom->type;
   tagint *tag = atom->tag;