diff --git a/Cargo.toml b/Cargo.toml
index 443ba4271b..d36b81e965 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ repository = "https://github.com/japaric/cortex-m-rtfm"
 version = "0.2.0"
 
 [dependencies]
-cortex-m = "0.3.0"
+cortex-m = "0.3.1"
 static-ref = "0.2.0"
 
 [dependencies.cortex-m-rtfm-macros]
diff --git a/src/lib.rs b/src/lib.rs
index 26bc2bd0ff..6ee98d79f6 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -19,13 +19,6 @@ use cortex_m::interrupt::Nr;
 #[cfg(not(armv6m))]
 use cortex_m::register::{basepri_max, basepri};
 
-#[cfg(not(armv6m))]
-macro_rules! barrier {
-    () => {
-        asm!("" ::: "memory" : "volatile");
-    }
-}
-
 #[inline(always)]
 unsafe fn claim<T, U, R, F, G>(
     data: T,
@@ -54,9 +47,7 @@ where
                     let old = basepri::read();
                     let hw = (max_priority - ceiling) << (8 - nvic_prio_bits);
                     basepri_max::write(hw);
-                    barrier!();
                     let ret = f(g(data), &mut Threshold(ceiling));
-                    barrier!();
                     basepri::write(old);
                     ret
                 }