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-rw-r--r--core/deco.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/core/deco.c b/core/deco.c
index 78ab23f0a..c3a8059c0 100644
--- a/core/deco.c
+++ b/core/deco.c
@@ -292,7 +292,7 @@ double tissue_tolerance_calc(struct deco_state *ds, const struct dive *dive, dou
if (plot_depth) {
++sum1;
sumx += plot_depth;
- sumxx += plot_depth * plot_depth;
+ sumxx += (long)plot_depth * plot_depth;
double n2_gradient, he_gradient, total_gradient;
n2_gradient = update_gradient(ds, depth_to_bar(plot_depth, &displayed_dive), ds->bottom_n2_gradient[ds->ci_pointing_to_guiding_tissue]);
he_gradient = update_gradient(ds, depth_to_bar(plot_depth, &displayed_dive), ds->bottom_he_gradient[ds->ci_pointing_to_guiding_tissue]);