diff --git a/src/librustc/middle/ty.rs b/src/librustc/middle/ty.rs
index 915bb07df8e0..9905701e058d 100644
--- a/src/librustc/middle/ty.rs
+++ b/src/librustc/middle/ty.rs
@@ -2435,7 +2435,7 @@ pub fn type_structurally_contains_uniques(cx: ctxt, ty: t) -> bool {
 
 pub fn type_is_integral(ty: t) -> bool {
     match get(ty).sty {
-      ty_infer(IntVar(_)) | ty_int(_) | ty_uint(_) | ty_bool => true,
+      ty_infer(IntVar(_)) | ty_int(_) | ty_uint(_) => true,
       _ => false
     }
 }
diff --git a/src/test/compile-fail/unop-neg-bool.rs b/src/test/compile-fail/unop-neg-bool.rs
new file mode 100644
index 000000000000..6f1f1aba4593
--- /dev/null
+++ b/src/test/compile-fail/unop-neg-bool.rs
@@ -0,0 +1,3 @@
+fn main() {
+    -true; //~ ERROR cannot apply unary operator `-` to type `bool`
+}