diff --git a/crates/nu_plugin_polars/src/dataframe/values/nu_expression/custom_value.rs b/crates/nu_plugin_polars/src/dataframe/values/nu_expression/custom_value.rs
index ea751b0255..977f9edabc 100644
--- a/crates/nu_plugin_polars/src/dataframe/values/nu_expression/custom_value.rs
+++ b/crates/nu_plugin_polars/src/dataframe/values/nu_expression/custom_value.rs
@@ -63,31 +63,18 @@ fn compute_with_value(
     op: Span,
     right: &Value,
 ) -> Result<Value, ShellError> {
-    let rhs_span = right.span();
     match right {
-        Value::Custom { val: rhs, .. } => {
-            let rhs = rhs.as_any().downcast_ref::<NuExpression>().ok_or_else(|| {
-                ShellError::TypeMismatch {
-                    err_message: "Right hand side not a dataframe expression".into(),
-                    span: rhs_span,
-                }
-            })?;
-
-            match rhs.as_ref() {
-                polars::prelude::Expr::Literal(..) => with_operator(
-                    (plugin, engine),
-                    operator,
-                    left,
-                    rhs,
-                    lhs_span,
-                    right.span(),
-                    op,
-                ),
-                _ => Err(ShellError::TypeMismatch {
-                    err_message: "Only literal expressions or number".into(),
-                    span: right.span(),
-                }),
-            }
+        Value::Custom { .. } => {
+            let rhs = NuExpression::try_from_value(plugin, right)?;
+            with_operator(
+                (plugin, engine),
+                operator,
+                left,
+                &rhs,
+                lhs_span,
+                right.span(),
+                op,
+            )
         }
         _ => {
             let rhs = NuExpression::try_from_value(plugin, right)?;