diff --git a/src/librustc/lint/builtin.rs b/src/librustc/lint/builtin.rs
index 5ca474a8b1d..983e3a9922e 100644
--- a/src/librustc/lint/builtin.rs
+++ b/src/librustc/lint/builtin.rs
@@ -21,7 +21,8 @@ declare_lint! {
 declare_lint! {
     pub CONST_ERR,
     Deny,
-    "constant evaluation detected erroneous expression"
+    "constant evaluation detected erroneous expression",
+    report_in_external_macro: true
 }
 
 declare_lint! {