diff --git a/src/allographer/schema_builder/generators/mysql_generators.nim b/src/allographer/schema_builder/generators/mysql_generators.nim
index c3c14f74..9f1e05d5 100644
--- a/src/allographer/schema_builder/generators/mysql_generators.nim
+++ b/src/allographer/schema_builder/generators/mysql_generators.nim
@@ -369,7 +369,6 @@ proc foreignColumnGenerator*(name:string, isDefault:bool, default:int):string =
 
 proc strForeignColumnGenerator*(name:string, maxLength:int, isDefault:bool, default:string):string =
   result = &"`{name}` VARCHAR({maxLength})"
-  result.add(" UNIQUE")
   if isDefault:
     result.add(&" DEFAULT {default}")
 
diff --git a/src/allographer/schema_builder/generators/postgres_generators.nim b/src/allographer/schema_builder/generators/postgres_generators.nim
index e265fa70..22d3b642 100644
--- a/src/allographer/schema_builder/generators/postgres_generators.nim
+++ b/src/allographer/schema_builder/generators/postgres_generators.nim
@@ -393,7 +393,6 @@ proc foreignColumnGenerator*(name:string, isDefault:bool, default:int):string =
 
 proc strForeignColumnGenerator*(name:string, maxLength:int, isDefault:bool, default:string):string =
   result = &"\"{name}\" VARCHAR({maxLength})"
-  result.add(" UNIQUE")
   if isDefault:
     result.add(&" DEFAULT {default}")
 
diff --git a/src/allographer/schema_builder/generators/sqlite_generators.nim b/src/allographer/schema_builder/generators/sqlite_generators.nim
index 38f5744d..622a356b 100644
--- a/src/allographer/schema_builder/generators/sqlite_generators.nim
+++ b/src/allographer/schema_builder/generators/sqlite_generators.nim
@@ -278,7 +278,6 @@ proc foreignColumnGenerator*(name:string, isDefault:bool, default:int):string =
 
 proc strForeignColumnGenerator*(name:string, isDefault:bool, default:string):string =
   result = &"'{name}' VARCHAR"
-  result.add(" UNIQUE")
   if isDefault:
     result.add(&" DEFAULT {default}")