diff --git a/lint.go b/lint.go
index 52750b9..e84f46d 100644
--- a/lint.go
+++ b/lint.go
@@ -248,9 +248,7 @@
 	return i.impFn(i.packages, path, "")
 }
 
-func (i importer) ImportFrom(path, srcDir string, mode types.ImportMode) (*types.Package, error) {
-	return i.impFn(i.packages, path, srcDir)
-}
+// (importer).ImportFrom is in lint16.go.
 
 func (p *pkg) typeCheck() error {
 	config := &types.Config{
diff --git a/lint16.go b/lint16.go
new file mode 100644
index 0000000..34205aa
--- /dev/null
+++ b/lint16.go
@@ -0,0 +1,17 @@
+// Copyright (c) 2016 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 or at
+// https://developers.google.com/open-source/licenses/bsd.
+
+// +build go1.6
+
+package lint
+
+import "go/types"
+
+// This is in its own file so it can be ignored under Go 1.5.
+
+func (i importer) ImportFrom(path, srcDir string, mode types.ImportMode) (*types.Package, error) {
+	return i.impFn(i.packages, path, srcDir)
+}