diff --git a/src/builder.rs b/src/builder.rs
index 6720f6186d16..9e5ebf3a9a40 100644
--- a/src/builder.rs
+++ b/src/builder.rs
@@ -2454,7 +2454,6 @@ impl ToGccOrdering for AtomicOrdering {
         use MemOrdering::*;
 
         let ordering = match self {
-            AtomicOrdering::Unordered => __ATOMIC_RELAXED,
             AtomicOrdering::Relaxed => __ATOMIC_RELAXED, // TODO(antoyo): check if that's the same.
             AtomicOrdering::Acquire => __ATOMIC_ACQUIRE,
             AtomicOrdering::Release => __ATOMIC_RELEASE,