diff --git a/profile.c b/profile.c
index 79effeb39..3764b6fd9 100644
--- a/profile.c
+++ b/profile.c
@@ -853,13 +853,13 @@ void calculate_deco_information(struct dive *dive, struct divecomputer *dc, stru
 			time_stepsize = t1 - t0;
 		for (j = t0 + time_stepsize; j <= t1; j += time_stepsize) {
 			int depth = interpolate(entry[-1].depth, entry[0].depth, j - t0, t1 - t0);
-			boyles_law(depth_to_mbar(entry->depth, &displayed_dive) / 1000.0);
 			double min_pressure = add_segment(depth_to_mbar(depth, dive) / 1000.0,
 							  &dive->cylinder[entry->cylinderindex].gasmix, time_stepsize, entry->o2pressure.mbar, dive, entry->sac);
 			tissue_tolerance = min_pressure;
 			if ((t1 - j < time_stepsize) && (j < t1))
 				time_stepsize = t1 - j;
 		}
+		boyles_law(depth_to_mbar((entry->depth < (entry - 1)->ceiling) ? entry->depth : (entry - 1)->ceiling, &displayed_dive) / 1000.0);
 		if (t0 == t1)
 			entry->ceiling = (entry - 1)->ceiling;
 		else