diff --git a/v3/process/testdata/darwin/ps-ax-opid_fail b/v3/process/testdata/darwin/ps-ax-opid_fail
new file mode 100644
index 0000000..fce59ef
--- /dev/null
+++ b/v3/process/testdata/darwin/ps-ax-opid_fail
@@ -0,0 +1,10 @@
+  PID
+  245
+  247
+  248
+  249
+  254
+  262
+  264
+  265
+  267