diff --git a/profile.c b/profile.c
index 05e84cd73..8246a961b 100644
--- a/profile.c
+++ b/profile.c
@@ -442,8 +442,9 @@ static void check_setpoint_events(struct dive *dive, struct divecomputer *dc, st
 }
 
 
-struct plot_info calculate_max_limits_new(struct dive *dive, struct divecomputer *dc)
+struct plot_info calculate_max_limits_new(struct dive *dive)
 {
+	struct divecomputer *dc = &dive->dc;
 	static struct plot_info pi;
 	int maxdepth = dive->maxdepth.mm;
 	int maxtime = 0;
diff --git a/profile.h b/profile.h
index 0ae9a8f84..726d10573 100644
--- a/profile.h
+++ b/profile.h
@@ -68,7 +68,7 @@ struct ev_select {
 	bool plot_ev;
 };
 
-struct plot_info calculate_max_limits_new(struct dive *dive, struct divecomputer *dc);
+struct plot_info calculate_max_limits_new(struct dive *dive);
 void compare_samples(struct plot_data *e1, struct plot_data *e2, char *buf, int bufsize, int sum);
 struct plot_data *populate_plot_entries(struct dive *dive, struct divecomputer *dc, struct plot_info *pi);
 struct plot_info *analyze_plot_info(struct plot_info *pi);
diff --git a/qt-ui/profile/profilewidget2.cpp b/qt-ui/profile/profilewidget2.cpp
index 850f357cf..05553216d 100644
--- a/qt-ui/profile/profilewidget2.cpp
+++ b/qt-ui/profile/profilewidget2.cpp
@@ -518,7 +518,7 @@ void ProfileWidget2::plotDive(struct dive *d, bool force)
 	 * so I'll *not* calculate everything if something is not being
 	 * shown.
 	 */
-	plotInfo = calculate_max_limits_new(&displayed_dive, currentdc);
+	plotInfo = calculate_max_limits_new(&displayed_dive);
 	create_plot_info_new(&displayed_dive, currentdc, &plotInfo, !shouldCalculateMaxDepth);
 	if (shouldCalculateMaxTime)
 		maxtime = get_maxtime(&plotInfo);