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-rw-r--r--libcrystfel/src/histogram.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcrystfel/src/histogram.c b/libcrystfel/src/histogram.c
index b232cc24..ceefbe4b 100644
--- a/libcrystfel/src/histogram.c
+++ b/libcrystfel/src/histogram.c
@@ -136,7 +136,7 @@ static void calc_bins(Histogram *hi)
/* Tidy up rounding errors */
if ( j < 0 ) j = 0;
- if ( j > hi->n_bins ) j = hi->n_bins - 1;
+ if ( j >= hi->n_bins ) j = hi->n_bins - 1;
hi->bins[j]++;