diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index dffc6cec4d2..4569f07a0cb 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -646,6 +646,11 @@ impl Build {
             // Look for `submodule.$name.path = $path`
             // Sample output: `submodule.src/rust-installer.path src/tools/rust-installer`
             let submodule = Path::new(line.splitn(2, ' ').nth(1).unwrap());
+
+            if submodule == std::ffi::OsStr::new("yggdrasil-rt") {
+                continue;
+            }
+
             // Don't update the submodule unless it's already been cloned.
             if channel::GitInfo::new(false, submodule).is_managed_git_subrepository() {
                 self.update_submodule(submodule);