diff --git a/src/BPM/bond_bpm.h b/src/BPM/bond_bpm.h
index 42c44d61ce..3463c58e40 100644
--- a/src/BPM/bond_bpm.h
+++ b/src/BPM/bond_bpm.h
@@ -50,7 +50,7 @@ class BondBPM : public Bond {
   class FixUpdateSpecialBonds *fix_update_special_bonds;
 
   void process_broken(int, int);
-  typedef void (BondBPM::*FnPtrPack)(int, int, int);
+  using FnPtrPack = void (BondBPM::*)(int, int, int);
   FnPtrPack *pack_choice;    // ptrs to pack functions
   double *output_data;
 
diff --git a/src/MISC/pair_tracker.h b/src/MISC/pair_tracker.h
index e072f51f21..ada3aa7d20 100644
--- a/src/MISC/pair_tracker.h
+++ b/src/MISC/pair_tracker.h
@@ -63,7 +63,7 @@ class PairTracker : public Pair {
 
   int nvalues, ncount;
   double *output_data;
-  typedef void (PairTracker::*FnPtrPack)(int, int, int, double *);
+  using FnPtrPack = void (PairTracker::*)(int, int, int, double *);
   FnPtrPack *pack_choice;    // ptrs to pack functions
 
   void pack_id1(int, int, int, double *);