diff --git a/crates/core/src/db/datastore/locking_tx_datastore/mut_tx.rs b/crates/core/src/db/datastore/locking_tx_datastore/mut_tx.rs
index f598a9bdbe..5abccdf852 100644
--- a/crates/core/src/db/datastore/locking_tx_datastore/mut_tx.rs
+++ b/crates/core/src/db/datastore/locking_tx_datastore/mut_tx.rs
@@ -436,10 +436,20 @@ impl MutTxId {
     /// as the update machinery should disallow any incompatible change.
     /// However, for redundancy and internal soundness of the datastore,
     /// the compatibility is also checked here.
-    pub(crate) fn alter_table_row_type(&mut self, table_id: TableId, column_schemas: Vec<ColumnSchema>) -> Result<()> {
+    pub(crate) fn alter_table_row_type(
+        &mut self,
+        table_id: TableId,
+        mut column_schemas: Vec<ColumnSchema>,
+    ) -> Result<()> {
         // Write to the table in the tx state.
         let ((tx_table, ..), (commit_table, ..)) = self.get_or_create_insert_table_mut(table_id)?;
 
+        // Ensure the columns have the right `table_id`.
+        // NOTE(centril): This should already be done by the update machinery,
+        // but do it redundantly here too, just in case.
+        // This is not performance critical, so we don't care that there is overhead.
+        column_schemas.iter_mut().for_each(|c| c.table_id = table_id);
+
         // Try to change the tables into what we want.
         let old_column_schemas = tx_table.change_columns_to(column_schemas).map_err(TableError::from)?;
         // SAFETY: `commit_table` should have a schema identical to that of `tx_table`
diff --git a/crates/table/src/table.rs b/crates/table/src/table.rs
index 74686d033e..eb41970231 100644
--- a/crates/table/src/table.rs
+++ b/crates/table/src/table.rs
@@ -291,7 +291,8 @@ impl Table {
         Self::new_raw(schema, row_layout, static_layout, visitor_prog, squashed_offset, pm)
     }
 
-    /// Change the columns of `self` to those in `column_schemas`.
+    /// Change the columns of `self` to those in `column_schemas`
+    /// and returns the old column schemas.
     ///
     /// Returns an error if the new list of column is incompatible with the old.
     pub fn change_columns_to(
@@ -334,7 +335,8 @@ impl Table {
         unsafe { self.change_columns_to_unchecked(column_schemas, validate) }
     }
 
-    /// Change the columns of `self` to those in `column_schemas`.
+    /// Change the columns of `self` to those in `column_schemas`
+    /// and returns the old column schemas.
     ///
     /// Returns an error if the new list of column is incompatible with the old.
     ///