diff --git a/src/go/internal/gccgoimporter/parser.go b/src/go/internal/gccgoimporter/parser.go
index 1b1d07d3f6e..267c9953e49 100644
--- a/src/go/internal/gccgoimporter/parser.go
+++ b/src/go/internal/gccgoimporter/parser.go
@@ -599,7 +599,7 @@ func (p *parser) parseNamedType(nlist []interface{}) types.Type {
 			p.skipInlineBody()
 			p.expectEOL()
 
-			sig := types.NewSignature(receiver, params, results, isVariadic)
+			sig := types.NewSignatureType(receiver, nil, nil, params, results, isVariadic)
 			nt.AddMethod(types.NewFunc(token.NoPos, pkg, name, sig))
 		}
 	}
@@ -766,7 +766,7 @@ func (p *parser) parseFunctionType(pkg *types.Package, nlist []interface{}) *typ
 	params, isVariadic := p.parseParamList(pkg)
 	results := p.parseResultList(pkg)
 
-	*t = *types.NewSignature(nil, params, results, isVariadic)
+	*t = *types.NewSignatureType(nil, nil, nil, params, results, isVariadic)
 	return t
 }
 
diff --git a/src/go/types/universe.go b/src/go/types/universe.go
index 6045c61c301..4d52242e613 100644
--- a/src/go/types/universe.go
+++ b/src/go/types/universe.go
@@ -87,7 +87,7 @@ func defPredeclaredTypes() {
 		obj := NewTypeName(token.NoPos, nil, "error", nil)
 		obj.setColor(black)
 		res := NewVar(token.NoPos, nil, "", Typ[String])
-		sig := NewSignature(nil, nil, NewTuple(res), false)
+		sig := NewSignatureType(nil, nil, nil, nil, NewTuple(res), false)
 		err := NewFunc(token.NoPos, nil, "Error", sig)
 		ityp := &Interface{nil, obj, []*Func{err}, nil, nil, true, nil}
 		computeInterfaceTypeSet(nil, token.NoPos, ityp) // prevent races due to lazy computation of tset