diff --git a/src/reflect/all_test.go b/src/reflect/all_test.go
index 022350b322..3eca293675 100644
--- a/src/reflect/all_test.go
+++ b/src/reflect/all_test.go
@@ -2478,17 +2478,24 @@ func TestNumMethodOnDDD(t *testing.T) {
 }
 
 func TestPtrTo(t *testing.T) {
+	// This block of code means that the ptrToThis field of the
+	// reflect data for *unsafe.Pointer is non zero, see
+	// https://golang.org/issue/19003
+	var x unsafe.Pointer
+	var y = &x
+	var z = &y
+
 	var i int
 
-	typ := TypeOf(i)
+	typ := TypeOf(z)
 	for i = 0; i < 100; i++ {
 		typ = PtrTo(typ)
 	}
 	for i = 0; i < 100; i++ {
 		typ = typ.Elem()
 	}
-	if typ != TypeOf(i) {
-		t.Errorf("after 100 PtrTo and Elem, have %s, want %s", typ, TypeOf(i))
+	if typ != TypeOf(z) {
+		t.Errorf("after 100 PtrTo and Elem, have %s, want %s", typ, TypeOf(z))
 	}
 }
 
diff --git a/src/reflect/type.go b/src/reflect/type.go
index 9d6e7a6846..5d3c5c612a 100644
--- a/src/reflect/type.go
+++ b/src/reflect/type.go
@@ -1469,6 +1469,7 @@ func (t *rtype) ptrTo() *rtype {
 	pp := *prototype
 
 	pp.str = resolveReflectName(newName(s, "", "", false))
+	pp.ptrToThis = 0
 
 	// For the type structures linked into the binary, the
 	// compiler provides a good hash of the string.