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-rw-r--r--src/librustdoc/lib.rs2
-rw-r--r--src/test/rustdoc/issue-66159.rs1
2 files changed, 2 insertions, 1 deletions
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 6ed2d4b8477..69d9748bb88 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -144,7 +144,7 @@ fn opts() -> Vec<RustcOptGroup> {
         stable("extern", |o| {
             o.optmulti("", "extern", "pass an --extern to rustc", "NAME[=PATH]")
         }),
-        stable("extern-private", |o| {
+        unstable("extern-private", |o| {
             o.optmulti("", "extern-private",
                        "pass an --extern to rustc (compatibility only)", "NAME=PATH")
         }),
diff --git a/src/test/rustdoc/issue-66159.rs b/src/test/rustdoc/issue-66159.rs
index 88eca733870..a0a7adf6e81 100644
--- a/src/test/rustdoc/issue-66159.rs
+++ b/src/test/rustdoc/issue-66159.rs
@@ -1,4 +1,5 @@
 // aux-build:issue-66159-1.rs
+// compile-flags:-Z unstable-options
 // extern-private:issue_66159_1
 
 // The issue was an ICE which meant that we never actually generated the docs