diff --git a/src/camp_solver.c b/src/camp_solver.c
index 1b7454e89..c52ef3c78 100644
--- a/src/camp_solver.c
+++ b/src/camp_solver.c
@@ -1355,7 +1355,7 @@ int guess_helper(const realtype t_n, const realtype h_n, N_Vector y_n,
 
     // Scale incomplete jumps
     if (i_fast >= 0 && h_n > ZERO)
-      h_j *= 0.95 + 0.1 * rand() / (double)RAND_MAX;
+      h_j *= 0.95 + 0.1 * iter / (double)GUESS_MAX_ITER;
     h_j = t_n < t_0 + t_j + h_j ? t_n - (t_0 + t_j) : h_j;
 
     // Only make small changes to adjustment vectors used in Newton iteration