diff --git a/issues/400/Cargo.toml b/issues/400/Cargo.toml
new file mode 100644
index 00000000..d6200d12
--- /dev/null
+++ b/issues/400/Cargo.toml
@@ -0,0 +1,11 @@
+[workspace]
+# A separate workspace
+
+[package]
+name = "sea-orm-issues-400"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[dependencies]
+sea-orm = { path = "../../", features = [ "sqlx-mysql", "runtime-async-std-native-tls" ]}
diff --git a/issues/400/src/main.rs b/issues/400/src/main.rs
new file mode 100644
index 00000000..a9db43c3
--- /dev/null
+++ b/issues/400/src/main.rs
@@ -0,0 +1,3 @@
+mod model;
+
+pub fn main() {}
diff --git a/issues/400/src/model.rs b/issues/400/src/model.rs
new file mode 100644
index 00000000..a53eeb74
--- /dev/null
+++ b/issues/400/src/model.rs
@@ -0,0 +1,79 @@
+use std::marker::PhantomData;
+use sea_orm::entity::prelude::*;
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel)]
+#[sea_orm(table_name = "model")]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    pub id: AccountId<String>,
+    pub name: String,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {}
+
+impl ActiveModelBehavior for ActiveModel {}
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct AccountId<T>(Uuid, PhantomData<T>);
+
+impl<T> AccountId<T> {
+    pub fn new(id: Uuid) -> Self {
+        AccountId(id, PhantomData)
+    }
+}
+
+impl<T> From<AccountId<T>> for Uuid {
+    fn from(account_id: AccountId<T>) -> Self {
+        account_id.0
+    }
+}
+
+impl<T> sea_orm::TryFromU64 for AccountId<T> {
+    fn try_from_u64(_n: u64) -> Result<Self, sea_orm::DbErr> {
+        Err(sea_orm::DbErr::Exec(format!(
+            "{} cannot be converted from u64",
+            stringify!(AccountId<T>)
+        )))
+    }
+}
+
+impl<T> From<AccountId<T>> for sea_orm::Value {
+    fn from(source: AccountId<T>) -> Self {
+        sea_orm::Value::Uuid(Some(Box::new(source.into())))
+    }
+}
+
+impl<T> sea_orm::TryGetable for AccountId<T> {
+    fn try_get(
+        res: &sea_orm::QueryResult,
+        pre: &str,
+        col: &str,
+    ) -> Result<Self, sea_orm::TryGetError> {
+        let val: Uuid = res.try_get(pre, col).map_err(sea_orm::TryGetError::DbErr)?;
+        Ok(AccountId::<T>::new(val))
+    }
+}
+
+impl<T> sea_orm::sea_query::Nullable for AccountId<T> {
+    fn null() -> sea_orm::Value {
+        sea_orm::Value::Uuid(None)
+    }
+}
+
+impl<T> sea_orm::sea_query::ValueType for AccountId<T> {
+    fn try_from(v: sea_orm::Value) -> Result<Self, sea_orm::sea_query::ValueTypeErr> {
+        match v {
+            sea_orm::Value::Uuid(Some(x)) => Ok(AccountId::<T>::new(*x)),
+            _ => Err(sea_orm::sea_query::ValueTypeErr),
+        }
+    }
+
+    fn type_name() -> String {
+        stringify!(AccountId).to_owned()
+    }
+
+    fn column_type() -> sea_orm::sea_query::ColumnType {
+        sea_orm::sea_query::ColumnType::Uuid
+    }
+}
diff --git a/sea-orm-macros/src/derives/entity_model.rs b/sea-orm-macros/src/derives/entity_model.rs
index 7309a6c4..1cd9134b 100644
--- a/sea-orm-macros/src/derives/entity_model.rs
+++ b/sea-orm-macros/src/derives/entity_model.rs
@@ -1,10 +1,10 @@
 use crate::util::{escape_rust_keyword, trim_starting_raw_identifier};
 use heck::CamelCase;
 use proc_macro2::{Ident, Span, TokenStream};
-use quote::{format_ident, quote, quote_spanned};
+use quote::{quote, quote_spanned};
 use syn::{
     parse::Error, punctuated::Punctuated, spanned::Spanned, token::Comma, Attribute, Data, Fields,
-    Lit, Meta,
+    Lit, LitStr, Meta, Type,
 };
 
 /// Method to derive an Model
@@ -256,7 +256,7 @@ pub fn expand_derive_entity_model(data: Data, attrs: Vec<Attribute>) -> syn::Res
                             };
                             if col_type.is_empty() {
                                 let field_span = field.span();
-                                let ty = format_ident!("{}", temp);
+                                let ty: Type = LitStr::new(temp, field_span).parse()?;
                                 let def = quote_spanned! { field_span => {
                                     std::convert::Into::<sea_orm::ColumnType>::into(
                                         <#ty as sea_orm::sea_query::ValueType>::column_type()