diff --git a/src/cmd/link/internal/ld/lib.go b/src/cmd/link/internal/ld/lib.go
index a5c72cf8b2..d13c93b9a1 100644
--- a/src/cmd/link/internal/ld/lib.go
+++ b/src/cmd/link/internal/ld/lib.go
@@ -647,6 +647,12 @@ func (ctxt *Link) loadlib() {
 				if !s.Attr.OnList() {
 					ctxt.Textp = append(ctxt.Textp, s)
 					s.Attr |= AttrOnList
+					// dupok symbols may be defined in multiple packages. its
+					// associated package is chosen sort of arbitrarily (the
+					// first containing package that the linker loads). canonicalize
+					// it here to the package with which it will be laid down
+					// in text.
+					s.File = pathtoprefix(lib.Pkg)
 				}
 			}
 		}
diff --git a/test/fixedbugs/issue19764.dir/a.go b/test/fixedbugs/issue19764.dir/a.go
new file mode 100644
index 0000000000..64538e5bdf
--- /dev/null
+++ b/test/fixedbugs/issue19764.dir/a.go
@@ -0,0 +1,15 @@
+// Copyright 2017 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.
+
+package a
+
+type T struct{ _ int }
+func (t T) M() {}
+
+type I interface { M() }
+
+func F() {
+	var t I = &T{}
+	t.M() // call to the wrapper (*T).M
+}
diff --git a/test/fixedbugs/issue19764.dir/b.go b/test/fixedbugs/issue19764.dir/b.go
new file mode 100644
index 0000000000..d39f125f37
--- /dev/null
+++ b/test/fixedbugs/issue19764.dir/b.go
@@ -0,0 +1,13 @@
+// Copyright 2017 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.
+
+package main
+
+import "./a"
+
+func main() {
+	var x a.I = &a.T{}
+	x.M() // call to the wrapper (*T).M
+	a.F() // make sure a.F is not dead, which also calls (*T).M inside package a
+}
diff --git a/test/fixedbugs/issue19764.go b/test/fixedbugs/issue19764.go
new file mode 100644
index 0000000000..26fb00be2d
--- /dev/null
+++ b/test/fixedbugs/issue19764.go
@@ -0,0 +1,10 @@
+// rundir
+
+// Copyright 2017 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 19764: test that the linker's trampoline insertion
+// pass is happy with direct calls to interface wrappers that
+// may be defined in multiple packages.
+package ignore