diff --git a/ex-1/tests.c b/ex-1/tests.c
index 91b86d1..52352cc 100644
--- a/ex-1/tests.c
+++ b/ex-1/tests.c
@@ -93,7 +93,6 @@ double numeric_mode(double min, double max,
 
   // initialize minimization
   double x = 0;
-  int    iter = 0;
   int    max_iter = 100;
   double prec = 1e-7;
   int    status;
@@ -102,15 +101,14 @@ double numeric_mode(double min, double max,
   gsl_min_fminimizer_set(s, &npdf, x, min, max);
 
   // minimisation
-  do {
-      iter++;
-      status = gsl_min_fminimizer_iterate(s);
-      x      = gsl_min_fminimizer_x_minimum(s);
-      min    = gsl_min_fminimizer_x_lower(s);
-      max    = gsl_min_fminimizer_x_upper(s);
-      status = gsl_min_test_interval(min, max, 0, prec);
-
-  } while (status == GSL_CONTINUE && iter < max_iter);
+  for (int iter = 0; status == GSL_CONTINUE && iter < max_iter; iter++)
+    {
+    status = gsl_min_fminimizer_iterate(s);
+    x      = gsl_min_fminimizer_x_minimum(s);
+    min    = gsl_min_fminimizer_x_lower(s);
+    max    = gsl_min_fminimizer_x_upper(s);
+    status = gsl_min_test_interval(min, max, 0, prec);
+    }
 
   /* The error is simply given by the width of
    * the final interval containing the solution