diff --git a/arrow-cast/src/cast/mod.rs b/arrow-cast/src/cast/mod.rs
index e5ab304bb6f..c9de714e7d5 100644
--- a/arrow-cast/src/cast/mod.rs
+++ b/arrow-cast/src/cast/mod.rs
@@ -4403,17 +4403,17 @@ mod tests {
         test_unsafe_string_to_interval_err!(
             vec![Some("foobar")],
             IntervalUnit::YearMonth,
-            r#"Not yet implemented: Unsupported Interval Expression with value "foobar""#
+            r#"Parser error: Invalid input syntax for type interval: "foobar""#
         );
         test_unsafe_string_to_interval_err!(
             vec![Some("foobar")],
             IntervalUnit::DayTime,
-            r#"Not yet implemented: Unsupported Interval Expression with value "foobar""#
+            r#"Parser error: Invalid input syntax for type interval: "foobar""#
         );
         test_unsafe_string_to_interval_err!(
             vec![Some("foobar")],
             IntervalUnit::MonthDayNano,
-            r#"Not yet implemented: Unsupported Interval Expression with value "foobar""#
+            r#"Parser error: Invalid input syntax for type interval: "foobar""#
         );
         test_unsafe_string_to_interval_err!(
             vec![Some("2 months 31 days 1 second")],
diff --git a/arrow-cast/src/parse.rs b/arrow-cast/src/parse.rs
index a44c7ad4f9f..427672a6a83 100644
--- a/arrow-cast/src/parse.rs
+++ b/arrow-cast/src/parse.rs
@@ -1381,8 +1381,8 @@ fn parse_interval_components(
 
     // invalid amounts?
     if !invalid_amounts.is_empty() {
-        return Err(ArrowError::NotYetImplemented(format!(
-            "Unsupported Interval Expression with value {value:?}"
+        return Err(ArrowError::ParseError(format!(
+            "Invalid input syntax for type interval: {value:?}"
         )));
     }