diff --git a/src/librustc/middle/typeck/collect.rs b/src/librustc/middle/typeck/collect.rs
index 9c69e6fd85cc7..9b84c813de1a6 100644
--- a/src/librustc/middle/typeck/collect.rs
+++ b/src/librustc/middle/typeck/collect.rs
@@ -509,10 +509,11 @@ pub fn compare_impl_method(tcx: ty::ctxt,
         tcx.sess.span_err(
             cm.span,
             format!("method `{}` has {} parameter{} \
-                  but the trait has {}",
+                  but the trait method `{}` has {}",
                  tcx.sess.str_of(trait_m.ident),
                  impl_m.fty.sig.inputs.len(),
                  if impl_m.fty.sig.inputs.len() == 1 { "" } else { "s" },
+                 ty::item_path_str(tcx, trait_m.def_id),
                  trait_m.fty.sig.inputs.len()));
         return;
     }
diff --git a/src/test/compile-fail/trait-impl-different-num-params.rs b/src/test/compile-fail/trait-impl-different-num-params.rs
index 7039e05019958..1d13bcf6b21d4 100644
--- a/src/test/compile-fail/trait-impl-different-num-params.rs
+++ b/src/test/compile-fail/trait-impl-different-num-params.rs
@@ -13,7 +13,7 @@ trait foo {
 }
 impl foo for int {
     fn bar(&self) -> int {
-        //~^ ERROR method `bar` has 0 parameters but the trait has 1
+        //~^ ERROR method `bar` has 0 parameters but the trait method `foo::bar` has 1
         *self
     }
 }