diff --git a/src/librustsyntax/visit.rs b/src/librustsyntax/visit.rs
index 3ebc5616c1c..c5be778572b 100644
--- a/src/librustsyntax/visit.rs
+++ b/src/librustsyntax/visit.rs
@@ -160,6 +160,7 @@ fn visit_item<E>(i: @item, e: E, v: vt<E>) {
         v.visit_ty_params(tps, e, v);
         for methods.each {|m|
             for m.decl.inputs.each {|a| v.visit_ty(a.ty, e, v); }
+            v.visit_ty_params(m.tps, e, v);
             v.visit_ty(m.decl.output, e, v);
         }
       }
diff --git a/src/rustc/middle/resolve.rs b/src/rustc/middle/resolve.rs
index c51df5bd391..884ced0a7f6 100644
--- a/src/rustc/middle/resolve.rs
+++ b/src/rustc/middle/resolve.rs
@@ -549,7 +549,7 @@ fn visit_item_with_scope(e: @env, i: @ast::item,
     let sc = @cons(scope_item(i), sc);
     alt i.node {
       ast::item_impl(tps, _, ifce, sty, methods) {
-        visit::visit_ty_params(tps, sc, v);
+        v.visit_ty_params(tps, sc, v);
         option::iter(ifce) {|p| visit::visit_path(p.path, sc, v)};
         v.visit_ty(sty, sc, v);
         for methods.each {|m|
@@ -560,15 +560,17 @@ fn visit_item_with_scope(e: @env, i: @ast::item,
         }
       }
       ast::item_iface(tps, _, methods) {
-        visit::visit_ty_params(tps, sc, v);
+        v.visit_ty_params(tps, sc, v);
+        let isc = @cons(scope_method(i.id, tps), sc);
         for methods.each {|m|
+            v.visit_ty_params(m.tps, isc, v);
             let msc = @cons(scope_method(i.id, tps + m.tps), sc);
             for m.decl.inputs.each {|a| v.visit_ty(a.ty, msc, v); }
             v.visit_ty(m.decl.output, msc, v);
         }
       }
       ast::item_class(tps, ifaces, members, ctor, m_dtor, _) {
-        visit::visit_ty_params(tps, sc, v);
+        v.visit_ty_params(tps, sc, v);
         // Can maybe skip this now that we require self on class fields
         let class_scope = @cons(scope_item(i), sc);
         /* visit the constructor... */
diff --git a/src/test/run-pass/issue-2311.rs b/src/test/run-pass/issue-2311.rs
new file mode 100644
index 00000000000..f46228e9846
--- /dev/null
+++ b/src/test/run-pass/issue-2311.rs
@@ -0,0 +1,6 @@
+iface clam<A> { }
+iface foo<A> {
+   fn bar<B,C:clam<A>>(c: C) -> B;
+}
+
+fn main() { }