diff --git a/src/libstd/libc.rs b/src/libstd/libc.rs
index 1cbaa5f06a67f..ac4be8fec93e4 100644
--- a/src/libstd/libc.rs
+++ b/src/libstd/libc.rs
@@ -1160,6 +1160,7 @@ pub mod types {
             }
         }
 
+        #[cfg(target_arch = "arm")]
         #[cfg(target_arch = "x86")]
         pub mod arch {
             pub mod c95 {