diff --git a/crates/engine/src/cmd/modify2.rs b/crates/engine/src/cmd/modify2.rs
index 3aa1396..79d74e4 100644
--- a/crates/engine/src/cmd/modify2.rs
+++ b/crates/engine/src/cmd/modify2.rs
@@ -454,10 +454,17 @@ impl Interactive for PeditM {
         let sel = s.selection();
         if let [h] = sel.as_slice() {
             let k = curves::entity(s, *h)?.kind;
-            if matches!(k, EntityKind::LwPolyline(_)) {
-                self.h = Some(*h);
-                self.original = self.poly(s).map(|p| p.vertices);
-                self.phase = PPhase::Main;
+            match k {
+                EntityKind::LwPolyline(_) => {
+                    self.h = Some(*h);
+                    self.original = self.poly(s).map(|p| p.vertices);
+                    self.phase = PPhase::Main;
+                }
+                EntityKind::Line(_) | EntityKind::Arc(_) => {
+                    self.h = Some(*h);
+                    self.phase = PPhase::Convert;
+                }
+                _ => {}
             }
         }
         Ok(Step::Continue)
diff --git a/crates/engine/src/cmd/modify2_tests.rs b/crates/engine/src/cmd/modify2_tests.rs
index 0b72ece..f28a450 100644
--- a/crates/engine/src/cmd/modify2_tests.rs
+++ b/crates/engine/src/cmd/modify2_tests.rs
@@ -683,3 +683,27 @@ fn editing_commands_leave_locked_layer_objects_alone() {
     s.execute("explode", &json!({"handles": [r]})).unwrap();
     assert_ne!(model_dump(&s), before);
 }
+
+#[test]
+fn pedit_preselected_line_asks_to_convert() {
+    // Yes converts the pre-selected line and continues with the option prompt.
+    let mut s = Session::new();
+    let l = h(&s.execute("line", &json!({"points": [[0, 0], [10, 0]]})).unwrap());
+    s.set_selection(vec![Handle::parse_hex(&l).unwrap()]);
+    s.cmdline("pedit").unwrap();
+    assert!(s.running.is_some());
+    assert!(matches!(kind(&s, &l), EntityKind::Line(_)), "nothing changes before the answer");
+    s.cmdline("y").unwrap();
+    assert!(matches!(kind(&s, &l), EntityKind::LwPolyline(_)));
+    s.cmdline("c").unwrap();
+    s.cmdline("").unwrap();
+    assert!(s.running.is_none());
+
+    // No ends the command and leaves the line alone.
+    let m = h(&s.execute("line", &json!({"points": [[0, 5], [10, 5]]})).unwrap());
+    s.set_selection(vec![Handle::parse_hex(&m).unwrap()]);
+    s.cmdline("pedit").unwrap();
+    s.cmdline("n").unwrap();
+    assert!(s.running.is_none());
+    assert!(matches!(kind(&s, &m), EntityKind::Line(_)));
+}