diff --git a/ibis/backends/duckdb/tests/test_udf.py b/ibis/backends/duckdb/tests/test_udf.py
index 78612579fdd6..3f991f17b247 100644
--- a/ibis/backends/duckdb/tests/test_udf.py
+++ b/ibis/backends/duckdb/tests/test_udf.py
@@ -174,8 +174,7 @@ def test_builtin_fixed_length_array_udf(array_cosine_t, column, expr_fn):
     @udf.scalar.builtin
     def array_cosine_similarity(a, b) -> float: ...
 
-    expr = array_cosine_similarity(
-        expr_fn(array_cosine_t[column]), expr_fn(array_cosine_t[column])
-    )
+    expr = expr_fn(array_cosine_t[column])
+    expr = array_cosine_similarity(expr, expr)
     result = expr.execute()
-    assert round(result.iat[0], 3) == 1.0
+    assert result.iat[0] == 1.0