diff --git a/src/liballoc_system/lib.rs b/src/liballoc_system/lib.rs
index 15283036bb495..0e6887a508223 100644
--- a/src/liballoc_system/lib.rs
+++ b/src/liballoc_system/lib.rs
@@ -405,6 +405,7 @@ mod platform {
 
     #[cfg(not(target_feature = "atomics"))]
     mod lock {
+        #[inline]
         pub fn lock() {} // no atomics, no threads, that's easy!
     }
 }