diff --git a/dev/archery/archery/integration/datagen.py b/dev/archery/archery/integration/datagen.py
index 1ce2775c160b8..ff10c0bb03fb6 100644
--- a/dev/archery/archery/integration/datagen.py
+++ b/dev/archery/archery/integration/datagen.py
@@ -1520,8 +1520,7 @@ def generate_decimal128_case():
         for i, precision in enumerate(range(3, 39))
     ]
 
-    possible_batch_sizes = 7, 10
-    batch_sizes = [possible_batch_sizes[i % 2] for i in range(len(fields))]
+    batch_sizes = [7, 10]
     # 'decimal' is the original name for the test, and it must match
     # provide "gold" files that test backwards compatibility, so they
     # can be appropriately skipped.
@@ -1535,8 +1534,7 @@ def generate_decimal256_case():
         for i, precision in enumerate(range(37, 70))
     ]
 
-    possible_batch_sizes = 7, 10
-    batch_sizes = [possible_batch_sizes[i % 2] for i in range(len(fields))]
+    batch_sizes = [7, 10]
     return _generate_file('decimal256', fields, batch_sizes)