diff --git a/datafusion/expr/src/lib.rs b/datafusion/expr/src/lib.rs
index c5016a18d443..a57fd80c48e1 100644
--- a/datafusion/expr/src/lib.rs
+++ b/datafusion/expr/src/lib.rs
@@ -71,7 +71,8 @@ pub use datafusion_expr_common::columnar_value::ColumnarValue;
 pub use datafusion_expr_common::groups_accumulator::{EmitTo, GroupsAccumulator};
 pub use datafusion_expr_common::operator::Operator;
 pub use datafusion_expr_common::signature::{
-    ArrayFunctionSignature, Signature, TypeSignature, Volatility, TIMEZONE_WILDCARD,
+    ArrayFunctionSignature, Signature, TypeSignature, TypeSignatureClass, Volatility,
+    TIMEZONE_WILDCARD,
 };
 pub use datafusion_expr_common::type_coercion::binary;
 pub use expr::{