diff --git a/src/operator.rs b/src/operator.rs
index 58003331e637..ed69c8043939 100644
--- a/src/operator.rs
+++ b/src/operator.rs
@@ -13,7 +13,6 @@
     bytes_to_f64,
     f32_to_bytes,
     f64_to_bytes,
-    bytes_to_bool,
 };
 
 impl<'a, 'tcx> EvalContext<'a, 'tcx> {
@@ -334,7 +333,7 @@ pub fn unary_op<'tcx>(
     let bytes = val.to_bytes()?;
 
     let result_bytes = match (un_op, val_kind) {
-        (Not, Bool) => !bytes_to_bool(bytes) as u128,
+        (Not, Bool) => !val.to_bool()? as u128,
 
         (Not, U8)  => !(bytes as u8) as u128,
         (Not, U16) => !(bytes as u16) as u128,
diff --git a/src/value.rs b/src/value.rs
index 99630f6006f8..9f7d3eafe1fb 100644
--- a/src/value.rs
+++ b/src/value.rs
@@ -23,12 +23,6 @@ pub(super) fn f64_to_bytes(f: f64) -> u128 {
     unsafe { transmute::<f64, u64>(f) as u128 }
 }
 
-pub(super) fn bytes_to_bool(n: u128) -> bool {
-    // FIXME(solson): Can we reach here due to user error?
-    assert!(n == 0 || n == 1, "bytes interpreted as bool were {}", n);
-    n & 1 == 1
-}
-
 /// A `Value` represents a single self-contained Rust value.
 ///
 /// A `Value` can either refer to a block of memory inside an allocation (`ByRef`) or to a primitve