diff --git a/common_types/src/datum.rs b/common_types/src/datum.rs
index 6f01baa8d8..eff9923fcc 100644
--- a/common_types/src/datum.rs
+++ b/common_types/src/datum.rs
@@ -225,8 +225,8 @@ impl DatumKind {
             DatumKind::UInt8 => 1,
             DatumKind::Int64 => 8,
             DatumKind::Int32 => 4,
-            DatumKind::Int16 => 8,
-            DatumKind::Int8 => 8,
+            DatumKind::Int16 => 2,
+            DatumKind::Int8 => 1,
             DatumKind::Boolean => 1,
             DatumKind::Date => 4,
             DatumKind::Time => 8,