diff --git a/alembic/versions/0027_unify_company_to_contact.py b/alembic/versions/0027_unify_company_to_contact.py
index c5c6cc8..177e030 100644
--- a/alembic/versions/0027_unify_company_to_contact.py
+++ b/alembic/versions/0027_unify_company_to_contact.py
@@ -38,7 +38,10 @@ def upgrade():
     )
     # Rename company_id to contact_id in mails (if column exists)
     conn = op.get_bind()
-    if conn.dialect.has_column(conn, "mails", "company_id"):
+    result = conn.execute(
+        sa.text("SELECT 1 FROM information_schema.columns WHERE table_name='mails' AND column_name='company_id'")
+    ).fetchone()
+    if result:
         op.alter_column("mails", "company_id", new_column_name="contact_id")
 
 
@@ -61,5 +64,8 @@ def downgrade():
     )
     # Rename contact_id back to company_id in mails
     conn = op.get_bind()
-    if conn.dialect.has_column(conn, "mails", "contact_id"):
+    result = conn.execute(
+        sa.text("SELECT 1 FROM information_schema.columns WHERE table_name='mails' AND column_name='contact_id'")
+    ).fetchone()
+    if result:
         op.alter_column("mails", "contact_id", new_column_name="company_id")