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-rw-r--r--tests/helpers/strategies.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/tests/helpers/strategies.py b/tests/helpers/strategies.py
index 171c721..a30a34c 100644
--- a/tests/helpers/strategies.py
+++ b/tests/helpers/strategies.py
@@ -38,7 +38,8 @@ positions = st.integers(min_value=0,
 references = st.text(st.characters(codec="ascii",
                                    categories=(),
                                    include_characters=("A", "G", "C", "T")),
-                     min_size=1)
+                     min_size=1,
+                     max_size=1)
 
 sample_names = (tabless_printable_ascii_text
                 .filter(negate(is_genotype_metadata_column)))