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-rw-r--r--activerecord/test/fixtures/db_definitions/firebird.sql2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/test/fixtures/db_definitions/firebird.sql b/activerecord/test/fixtures/db_definitions/firebird.sql
index 729c2097df..c523bfe7bb 100644
--- a/activerecord/test/fixtures/db_definitions/firebird.sql
+++ b/activerecord/test/fixtures/db_definitions/firebird.sql
@@ -1,4 +1,4 @@
-CREATE DOMAIN D_BOOLEAN AS SMALLINT CHECK (VALUE IN (0, 1));
+CREATE DOMAIN D_BOOLEAN AS SMALLINT CHECK (VALUE IN (0, 1) OR VALUE IS NULL);
CREATE TABLE accounts (
id BIGINT NOT NULL,