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-rw-r--r--src/cubeit.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/cubeit.c b/src/cubeit.c
index cfa3e8ce..18b20556 100644
--- a/src/cubeit.c
+++ b/src/cubeit.c
@@ -138,8 +138,8 @@ static void interpolate_linear(double *vals, double v,
val1 = v*(1.0-f);
val2 = v*f;
- vals[xs*ys*k + xs*yv + xv] = val1;
- vals[xs*ys*(k+1) + xs*yv + xv] = val2;
+ vals[xs*ys*k + xs*yv + xv] += val1;
+ vals[xs*ys*(k+1) + xs*yv + xv] += val2;
}