diff --git a/poky/meta/recipes-devtools/rust/rust.inc b/poky/meta/recipes-devtools/rust/rust.inc
index 1d6f99a..f39228e 100644
--- a/poky/meta/recipes-devtools/rust/rust.inc
+++ b/poky/meta/recipes-devtools/rust/rust.inc
@@ -27,7 +27,7 @@
 
 # We can't use RUST_BUILD_SYS here because that may be "musl" if
 # TCLIBC="musl". Snapshots are always -unknown-linux-gnu
-SNAPSHOT_BUILD_SYS = "${BUILD_ARCH}-unknown-linux-gnu"
+SNAPSHOT_BUILD_SYS = "${RUST_BUILD_ARCH}-unknown-linux-gnu"
 setup_cargo_environment () {
     # The first step is to build bootstrap and some early stage tools,
     # these are build for the same target as the snapshot, e.g.