diff --git a/minus/minus.h b/minus/minus.h
index 7fadc68..04b8071 100644
--- a/minus/minus.h
+++ b/minus/minus.h
@@ -140,10 +140,9 @@ struct minus_core<P, F>::track_settings {
   F dt_decrease_factor_;  // m2 stepDecreaseFactor not existent in DEFAULT, using what is in track.m2:77 
   F infinity_threshold_; // m2 InfinityThreshold
   F infinity_threshold2_;
-  unsigned max_corr_steps_;  // m2 maxCorrSteps (track.m2 param of rawSetParametersPT corresp to max_corr_steps in NAG.cpp)
-  unsigned num_successes_before_increase_; // m2 numberSuccessesBeforeIncrease
-  unsigned max_num_steps_; // maximum number of steps per track. 
-                       // Each step takes roughly 1 microseconds (tops)
+  unsigned max_num_steps_; // maximum number of steps per track.  Each step takes roughly 1 microseconds (tops)
+  char num_successes_before_increase_; // m2 numberSuccessesBeforeIncrease
+  char max_corr_steps_;  // m2 maxCorrSteps (track.m2 param of rawSetParametersPT corresp to max_corr_steps in NAG.cpp)
 };
 // Original settings from Tim: Fri Feb 22 12:00:06 -03 2019 Git 0ec3340
 // o9 = MutableHashTable{AffinePatches => DynamicPatch     }
diff --git a/minus/minus.hxx b/minus/minus.hxx
index 637c838..9cbbb8f 100644
--- a/minus/minus.hxx
+++ b/minus/minus.hxx
@@ -141,7 +141,7 @@ track(const track_settings &s, const C<F> s_sols[f::nve*f::nsols], const C<F> pa
     bool end_zone = false;
     v::copy(s_s, x0);
     *t0 = 0; *dt = t_step;
-    unsigned predictor_successes = 0;
+    char predictor_successes = 0;
 
     // track H(x,t) for t in [0,1]
     while (t_s->status == PROCESSING 
@@ -209,7 +209,7 @@ track(const track_settings &s, const C<F> s_sols[f::nve*f::nsols], const C<F> pa
       vp::add_to_self(x1t1, dxdt);
       
       /// CORRECTOR ///
-      unsigned n_corr_steps = 0;
+      char n_corr_steps = 0;
       bool is_successful;
       do {
         ++n_corr_steps;