diff --git a/src/cmd/compile/internal/gc/subr.go b/src/cmd/compile/internal/gc/subr.go
index d2d51a03667..3280710b224 100644
--- a/src/cmd/compile/internal/gc/subr.go
+++ b/src/cmd/compile/internal/gc/subr.go
@@ -2986,6 +2986,9 @@ func implements(t *Type, iface *Type, m **Type, samename **Type, ptr *int) bool
 	var followptr bool
 	var rcvr *Type
 	for im := iface.Type; im != nil; im = im.Down {
+		if im.Broke == 1 {
+			continue
+		}
 		imtype = methodfunc(im.Type, nil)
 		tm = ifacelookdot(im.Sym, t, &followptr, 0)
 		if tm == nil || tm.Nointerface || !Eqtype(methodfunc(tm.Type, nil), imtype) {
diff --git a/test/fixedbugs/issue10975.go b/test/fixedbugs/issue10975.go
new file mode 100644
index 00000000000..0a4b7be2a81
--- /dev/null
+++ b/test/fixedbugs/issue10975.go
@@ -0,0 +1,19 @@
+// errorcheck
+
+// Copyright 2015 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Issue 10975: Returning an invalid interface would cause 
+// `internal compiler error: getinarg: not a func`. 
+
+package main
+
+type I interface {
+	int	// ERROR "interface contains embedded non-interface int"
+}
+
+func New() I {
+	return struct{}{}
+}
+