diff --git a/src/lib.rs b/src/lib.rs
index eef735a965..eec40e4482 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -17,7 +17,7 @@ use cortex_m::ctxt::Context;
 use cortex_m::interrupt::Nr;
 #[cfg(not(thumbv6m))]
 use cortex_m::register::{basepri, basepri_max};
-use static_ref::{Ref, RefMut};
+use static_ref::Ref;
 use typenum::{Cmp, Equal, Unsigned};
 #[cfg(not(thumbv6m))]
 use typenum::{Greater, Less};
@@ -87,18 +87,6 @@ impl<T, CEILING> Resource<T, C<CEILING>> {
         unsafe { Ref::new(&*self.data.get()) }
     }
 
-    /// Like [Resource.claim](struct.Resource.html#method.claim) but returns a
-    /// `&mut-` reference
-    pub fn claim_mut<'task, PRIORITY>(
-        &'static self,
-        _priority: &'task mut P<PRIORITY>,
-    ) -> RefMut<'task, T>
-    where
-        CEILING: Cmp<PRIORITY, Output = Equal>,
-    {
-        unsafe { RefMut::new(&mut *self.data.get()) }
-    }
-
     /// Locks the resource for the duration of the critical section `f`
     ///
     /// For the duration of the critical section, tasks whose priority level is
@@ -124,28 +112,6 @@ impl<T, CEILING> Resource<T, C<CEILING>> {
             ret
         }
     }
-
-    /// Like [Resource.lock](struct.Resource.html#method.lock) but returns a
-    /// `&mut-` reference
-    ///
-    /// This method has additional an additional constraint: you can't borrow a
-    /// resource that has ceiling equal `CEILING`. This constraint is required
-    /// to preserve Rust aliasing rules.
-    #[cfg(not(thumbv6m))]
-    pub fn lock_mut<R, PRIORITY, F>(&'static self, _priority: &mut P<PRIORITY>, f: F) -> R
-        where F: FnOnce(RefMut<T>) -> R,
-              CEILING: Cmp<PRIORITY, Output = Greater> + Cmp<UMAX, Output = Less> + Level
-    {
-        unsafe {
-            let old_basepri = basepri::read();
-            basepri_max::write(<CEILING>::hw());
-            barrier!();
-            let ret = f(RefMut::new(&mut *self.data.get()));
-            barrier!();
-            basepri::write(old_basepri);
-            ret
-        }
-    }
 }
 
 unsafe impl<T, C> Sync for Resource<T, C>
diff --git a/tests/cfail/claim_mut.rs b/tests/cfail/claim_mut.rs
deleted file mode 100644
index 50da4a61f2..0000000000
--- a/tests/cfail/claim_mut.rs
+++ /dev/null
@@ -1,34 +0,0 @@
-#![feature(const_fn)]
-
-extern crate cortex_m_srp;
-
-use cortex_m_srp::{C2, P2, Resource};
-
-static R1: Resource<i32, C2> = Resource::new(0);
-
-fn j1(mut prio: P2) {
-    // OK only one `&mut-` reference to the data
-    let r1 = R1.claim_mut(&mut prio);
-}
-
-fn j2(prio: P2) {
-    // OK two `&-` references to the same data
-    let r1 = R1.claim(&prio);
-    let another_r1 = R1.claim(&prio);
-}
-
-fn j3(mut prio: P2) {
-    // CAN'T have a `&-` reference and a `&mut-` reference to the same data
-    let r1 = R1.claim(&prio);
-    let another_r1 = R1.claim_mut(&mut prio);
-    //~^ error
-}
-
-fn j4(mut prio: P2) {
-    // CAN'T have two `&mut-` references to the same data
-    let r1 = R1.claim_mut(&mut prio);
-    let another_r1 = R1.claim_mut(&mut prio);
-    //~^ error
-}
-
-fn main() {}