diff --git a/src/bootstrap/src/core/builder/cargo.rs b/src/bootstrap/src/core/builder/cargo.rs
index b4ef00bd4ea0d..f785254d90dae 100644
--- a/src/bootstrap/src/core/builder/cargo.rs
+++ b/src/bootstrap/src/core/builder/cargo.rs
@@ -566,6 +566,7 @@ impl Builder<'_> {
 
         if !has_modern_jobserver {
             cargo.env_remove("MAKEFLAGS");
+            cargo.env_remove("MFLAGS");
         }
 
         cargo
diff --git a/src/tools/cargo b/src/tools/cargo
index 888f675344eb1..a357df4c26fc1 160000
--- a/src/tools/cargo
+++ b/src/tools/cargo
@@ -1 +1 @@
-Subproject commit 888f675344eb1cf2308fd53183e667bdd2c58e51
+Subproject commit a357df4c26fc14514e66aae2a269456b5545c7db