diff --git a/crates/ghostty-os/src/open.rs b/crates/ghostty-os/src/open.rs
index 1974707..7fd337a 100644
--- a/crates/ghostty-os/src/open.rs
+++ b/crates/ghostty-os/src/open.rs
@@ -147,14 +147,18 @@ fn collect_output(child: &mut Child) -> io::Result<(Vec<u8>, Vec<u8>)> {
 }
 
 fn open_thread(mut child: Child) {
-    let stderr = match collect_output(&mut child) {
+    let collected = collect_output(&mut child);
+    // Zig's `try collectOutput` skips `wait` on error; reap anyway so the
+    // child does not stay a zombie (the pipes are closed by now).
+    let waited = child.wait();
+    let stderr = match collected {
         Ok((_stdout, stderr)) => stderr,
         Err(e) => {
             log::warn!("error collecting open command output err={e}");
             return;
         }
     };
-    if let Err(e) = child.wait() {
+    if let Err(e) = waited {
         log::warn!("error waiting for open command err={e}");
         return;
     }
diff --git a/docs/rewrite/DEVIANT_FIXES.md b/docs/rewrite/DEVIANT_FIXES.md
index a18174e..35b616b 100644
--- a/docs/rewrite/DEVIANT_FIXES.md
+++ b/docs/rewrite/DEVIANT_FIXES.md
@@ -57,6 +57,7 @@ when this file was written.
 | 29 | CLI: `+list-themes` diagnostics | `cli/list_themes.zig:124-131,171` | The messages ("Could not find the Ghostty resources directory", "No themes found...") go to a 4096-byte stderr buffer that is never flushed, so they are lost. | Flushed when the action ends. | `410d8fc` fix-deviant(cli) | `zig_writer::tests::unflushed_buffer_is_flushed_on_drop` |
 | 30 | CLI: stdout as a regular file | `std.fs.File.writer` (Zig 0.15.2) as used in `cli/show_face.zig:68-73`, `cli/help.zig:34`, `cli/validate_config.zig:43-46`, `cli/show_config.zig:84` | The writer `pwrite`s at its own offset starting at 0: with stdout redirected to a file, output overwrites itself and earlier file content, and `Writer.end` truncates. | Writes sequentially at the inherited descriptor's current offset (no `pwrite` from offset 0, so earlier content and the writers' own output are not overwritten; this appends only when the descriptor is opened for append, e.g. `>>`); no truncation. | `410d8fc` fix-deviant(cli) (append behaviour first in `f76179f`) | `zig_writer::tests::regular_file_output_is_complete_and_appended` |
 | 31 | GTK: `+new-window` D-Bus arguments | `apprt/gtk/ipc/new_window.zig:49-53` (`Bytes.new(ptr, len + 1)` + `Variant.newFromBytes(..., trusted = true)`) | Arguments are passed as trusted GVariant strings without validation; invalid UTF-8 or an interior NUL makes GIO abort the process while serializing (input-triggered crash). | `arguments_variant` validates first and returns `Error::IpcFailed` (message on stderr, no D-Bus call); valid arguments are byte-identical to Zig. | uncommitted (Z18) | `ipc::new_window::tests::invalid_dbus_strings_are_rejected_without_abort` (`ghostty-apprt-gtk`) |
+| 32 | OS: URL opener child reaping | `os/open.zig` (`try collectOutput(...)` before `wait()`) | When collecting the opener's output fails (e.g. more than 50 KiB on a stream), the error returns before `wait()`, leaving the child as a zombie. | The child is always reaped; the collection error is still logged. | (this register row's commit, fix-deviant(os)) | `ghostty-os` open tests |
 
 ## Upstream quirks deliberately kept (not fixed)