diff --git a/crates/rust-analyzer/Cargo.toml b/crates/rust-analyzer/Cargo.toml
index c37a0d17491d..6998209a078e 100644
--- a/crates/rust-analyzer/Cargo.toml
+++ b/crates/rust-analyzer/Cargo.toml
@@ -84,3 +84,4 @@ mbe = { path = "../mbe" }
 [features]
 jemalloc = ["jemallocator", "profile/jemalloc"]
 force-always-assert = ["always-assert/force"]
+in-rust-tree = []
diff --git a/crates/rust-analyzer/tests/slow-tests/tidy.rs b/crates/rust-analyzer/tests/slow-tests/tidy.rs
index 1d666fdf0f3d..63337214cd62 100644
--- a/crates/rust-analyzer/tests/slow-tests/tidy.rs
+++ b/crates/rust-analyzer/tests/slow-tests/tidy.rs
@@ -142,6 +142,7 @@ fn check_cargo_toml(path: &Path, text: String) {
     }
 }
 
+#[cfg(not(feature = "in-rust-tree"))]
 #[test]
 fn check_merge_commits() {
     let sh = &Shell::new().unwrap();