diff --git a/datafusion/functions-aggregate/src/lib.rs b/datafusion/functions-aggregate/src/lib.rs
index b39b1955bb07..32ca05b8cdd9 100644
--- a/datafusion/functions-aggregate/src/lib.rs
+++ b/datafusion/functions-aggregate/src/lib.rs
@@ -90,7 +90,7 @@ use std::sync::Arc;
 
 /// Fluent-style API for creating `Expr`s
 pub mod expr_fn {
-    pub use super::approx_distinct;
+    pub use super::approx_distinct::approx_distinct;
     pub use super::approx_median::approx_median;
     pub use super::approx_percentile_cont::approx_percentile_cont;
     pub use super::approx_percentile_cont_with_weight::approx_percentile_cont_with_weight;
diff --git a/datafusion/proto/tests/cases/roundtrip_logical_plan.rs b/datafusion/proto/tests/cases/roundtrip_logical_plan.rs
index 25223c3731be..811b4f86b7ec 100644
--- a/datafusion/proto/tests/cases/roundtrip_logical_plan.rs
+++ b/datafusion/proto/tests/cases/roundtrip_logical_plan.rs
@@ -67,7 +67,7 @@ use datafusion_expr::{
 };
 use datafusion_functions_aggregate::average::avg_udaf;
 use datafusion_functions_aggregate::expr_fn::{
-    array_agg, avg, bit_and, bit_or, bit_xor, bool_and, bool_or, corr,
+    approx_distinct, array_agg, avg, bit_and, bit_or, bit_xor, bool_and, bool_or, corr,
 };
 use datafusion_functions_aggregate::string_agg::string_agg;
 use datafusion_proto::bytes::{
@@ -717,6 +717,7 @@ async fn roundtrip_expr_api() -> Result<()> {
         var_pop(lit(2.2)),
         stddev(lit(2.2)),
         stddev_pop(lit(2.2)),
+        approx_distinct(lit(2)),
         approx_median(lit(2)),
         approx_percentile_cont(lit(2), lit(0.5)),
         approx_percentile_cont_with_weight(lit(2), lit(1), lit(0.5)),