Use full import paths for test protos.
diff --git a/proto/all_test.go b/proto/all_test.go
index aa67b10..41bb40f 100644
--- a/proto/all_test.go
+++ b/proto/all_test.go
@@ -44,8 +44,8 @@
 	"testing"
 	"time"
 
-	. "./testdata"
 	. "github.com/golang/protobuf/proto"
+	. "github.com/golang/protobuf/proto/testdata"
 )
 
 var globalO *Buffer