diff --git a/src/sv-pipeline/05_annotation/scripts/compute_AFs.py b/src/sv-pipeline/05_annotation/scripts/compute_AFs.py
index b805f70de..323a32b03 100755
--- a/src/sv-pipeline/05_annotation/scripts/compute_AFs.py
+++ b/src/sv-pipeline/05_annotation/scripts/compute_AFs.py
@@ -180,7 +180,7 @@ def calc_allele_freq(record, samples, prefix=None, hemi=False):
 
         # Adjust hemizygous allele number and allele count, if optioned
         if hemi:
-            AN = AN / 2
+            AN = round(AN / 2)
             # For hemizygous sites, AC must be the sum of all non-reference *genotypes*, not alleles
             AC = n_gts_with_gt_0_alts