diff --git a/src/MISC/fix_pair_tracker.cpp b/src/MISC/fix_pair_tracker.cpp
index 2a69bb7592..7939485aff 100644
--- a/src/MISC/fix_pair_tracker.cpp
+++ b/src/MISC/fix_pair_tracker.cpp
@@ -31,7 +31,7 @@ using namespace FixConst;
 /* ---------------------------------------------------------------------- */
 
 FixPairTracker::FixPairTracker(LAMMPS *lmp, int narg, char **arg) :
-    Fix(lmp, narg, arg), nvalues(0), array(NULL), vector(NULL), pack_choice(NULL)
+    Fix(lmp, narg, arg), nvalues(0), vector(NULL), array(NULL), pack_choice(NULL)
 {
   if (narg < 3) error->all(FLERR, "Illegal fix pair/tracker command");
   local_flag = 1;
diff --git a/src/MISC/fix_pair_tracker.h b/src/MISC/fix_pair_tracker.h
index 1458d7b80d..7c2e3ff322 100644
--- a/src/MISC/fix_pair_tracker.h
+++ b/src/MISC/fix_pair_tracker.h
@@ -35,9 +35,7 @@ class FixPairTracker : public Fix {
   void lost_contact(int, int, double, double, double, double);
 
  private:
-  int nvalues, never;
-  int nmax;
-  int store_flag;
+  int nvalues, nmax;
   int index_i, index_j;
   double tmin, rmin, rsum, time_initial, nstep_initial;
 
@@ -45,10 +43,6 @@ class FixPairTracker : public Fix {
   double **array;
   int **type_filter;
 
-  double lx;
-  double ly;
-  double lz;
-
   int ncount;
 
   void reallocate(int);
diff --git a/src/MISC/pair_tracker.cpp b/src/MISC/pair_tracker.cpp
index 0e6a63825b..2069561ee9 100644
--- a/src/MISC/pair_tracker.cpp
+++ b/src/MISC/pair_tracker.cpp
@@ -91,9 +91,6 @@ void PairTracker::compute(int eflag, int vflag)
   double **x = atom->x;
   double *radius = atom->radius;
   int *type = atom->type;
-  int *mask = atom->mask;
-  int nlocal = atom->nlocal;
-  int newton_pair = force->newton_pair;
 
   inum = list->inum;
   ilist = list->ilist;
@@ -444,8 +441,8 @@ void PairTracker::read_restart_settings(FILE *fp)
 
 /* ---------------------------------------------------------------------- */
 
-double PairTracker::single(int i, int j, int /*itype*/, int /*jtype*/, double rsq,
-                           double /*factor_coul*/, double /*factor_lj*/, double &fforce)
+double PairTracker::single(int /*i*/, int /*j*/, int /*itype*/, int /*jtype*/, double /*rsq*/,
+                           double /*factor_coul*/, double /*factor_lj*/, double &/*fforce*/)
 {
   return 0.0;
 }