diff --git a/src/MC/fix_atom_swap.cpp b/src/MC/fix_atom_swap.cpp
index aad8d7447f..7d817ffbb1 100644
--- a/src/MC/fix_atom_swap.cpp
+++ b/src/MC/fix_atom_swap.cpp
@@ -777,6 +777,7 @@ void FixAtomSwap::write_restart(FILE *fp)
   list[n++] = ubuf(next_reneighbor).d;
   list[n++] = nswap_attempts;
   list[n++] = nswap_successes;
+  list[n++] = ubuf(update->ntimestep).d;
 
   if (comm->me == 0) {
     int size = n * sizeof(double);
@@ -804,4 +805,8 @@ void FixAtomSwap::restart(char *buf)
 
   nswap_attempts = static_cast<int>(list[n++]);
   nswap_successes = static_cast<int>(list[n++]);
+
+  bigint ntimestep_restart = (bigint) ubuf(list[n++]).i;
+  if (ntimestep_restart != update->ntimestep)
+    error->all(FLERR,"Must not reset timestep when restarting fix atom/swap");
 }
diff --git a/src/MC/fix_gcmc.cpp b/src/MC/fix_gcmc.cpp
index f3a11a1000..7ab0879335 100644
--- a/src/MC/fix_gcmc.cpp
+++ b/src/MC/fix_gcmc.cpp
@@ -2543,7 +2543,7 @@ void FixGCMC::write_restart(FILE *fp)
   list[n++] = ndeletion_successes;
   list[n++] = ninsertion_attempts;
   list[n++] = ninsertion_successes;
-
+  list[n++] = ubuf(update->ntimestep).d;
 
   if (comm->me == 0) {
     int size = n * sizeof(double);
@@ -2577,6 +2577,10 @@ void FixGCMC::restart(char *buf)
   ndeletion_successes    = list[n++];
   ninsertion_attempts    = list[n++];
   ninsertion_successes   = list[n++];
+
+  bigint ntimestep_restart = (bigint) ubuf(list[n++]).i;
+  if (ntimestep_restart != update->ntimestep)
+    error->all(FLERR,"Must not reset timestep when restarting fix gcmc");
 }
 
 void FixGCMC::grow_molecule_arrays(int nmolatoms) {
diff --git a/src/MISC/fix_deposit.cpp b/src/MISC/fix_deposit.cpp
index a1d0669f32..66aed34846 100644
--- a/src/MISC/fix_deposit.cpp
+++ b/src/MISC/fix_deposit.cpp
@@ -798,11 +798,12 @@ void FixDeposit::options(int narg, char **arg)
 void FixDeposit::write_restart(FILE *fp)
 {
   int n = 0;
-  double list[4];
+  double list[5];
   list[n++] = random->state();
   list[n++] = ninserted;
   list[n++] = nfirst;
   list[n++] = ubuf(next_reneighbor).d;
+  list[n++] = ubuf(update->ntimestep).d;
 
   if (comm->me == 0) {
     int size = n * sizeof(double);
@@ -825,6 +826,10 @@ void FixDeposit::restart(char *buf)
   nfirst = static_cast<int> (list[n++]);
   next_reneighbor = (bigint) ubuf(list[n++]).i;
 
+  bigint ntimestep_restart = (bigint) ubuf(list[n++]).i;
+  if (ntimestep_restart != update->ntimestep)
+    error->all(FLERR,"Must not reset timestep when restarting this fix");
+
   random->reset(seed);
 }