diff --git a/mysql/expressions.go b/mysql/expressions.go
index b3f4ce5..53b1fa7 100644
--- a/mysql/expressions.go
+++ b/mysql/expressions.go
@@ -70,6 +70,12 @@ var DateTimeExp = jet.TimestampExp
 // Does not add sql cast to generated sql builder output.
 var TimestampExp = jet.TimestampExp
 
+// CustomExpression is used to define custom expressions.
+var CustomExpression = jet.CustomExpression
+
+// Token is used to define custom token in a custom expression.
+type Token = jet.Token
+
 // RawArgs is type used to pass optional arguments to Raw method
 type RawArgs = map[string]interface{}
 
diff --git a/postgres/expressions.go b/postgres/expressions.go
index 759f055..9872910 100644
--- a/postgres/expressions.go
+++ b/postgres/expressions.go
@@ -111,6 +111,12 @@ var (
 	TstzRangeExp = jet.TstzRangeExp
 )
 
+// CustomExpression is used to define custom expressions.
+var CustomExpression = jet.CustomExpression
+
+// Token is used to define custom token in a custom expression.
+type Token = jet.Token
+
 // RawArgs is type used to pass optional arguments to Raw method
 type RawArgs = map[string]interface{}
 
diff --git a/sqlite/expressions.go b/sqlite/expressions.go
index 93bb7b7..42ccc96 100644
--- a/sqlite/expressions.go
+++ b/sqlite/expressions.go
@@ -73,6 +73,12 @@ var DateTimeExp = jet.TimestampExp
 // Does not add sql cast to generated sql builder output.
 var TimestampExp = jet.TimestampExp
 
+// CustomExpression is used to define custom expressions.
+var CustomExpression = jet.CustomExpression
+
+// Token is used to define custom token in a custom expression.
+type Token = jet.Token
+
 // RawArgs is type used to pass optional arguments to Raw method
 type RawArgs = map[string]interface{}