diff --git a/datastore/go.mod b/datastore/go.mod
new file mode 100644
index 0000000..c05506d
--- /dev/null
+++ b/datastore/go.mod
@@ -0,0 +1,15 @@
+module cloud.google.com/go/datastore
+
+go 1.9
+
+require (
+	cloud.google.com/go v0.44.1
+	github.com/golang/protobuf v1.3.2
+	github.com/google/go-cmp v0.3.0
+	github.com/googleapis/gax-go/v2 v2.0.5
+	golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0 // indirect
+	google.golang.org/api v0.7.0
+	google.golang.org/appengine v1.6.1 // indirect
+	google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64
+	google.golang.org/grpc v1.21.1
+)
diff --git a/datastore/go.sum b/datastore/go.sum
new file mode 100644
index 0000000..b0be106
--- /dev/null
+++ b/datastore/go.sum
@@ -0,0 +1,116 @@
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+cloud.google.com/go v0.43.0/go.mod h1:BOSR3VbTLkk6FDC/TcffxP4NF/FFBGA5ku+jvKOP7pg=
+cloud.google.com/go/logging v1.0.0/go.mod h1:V1cc3ogwobYzQq5f2R7DS/GvRIrI4FKj01Gs5glwAls=
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diff --git a/datastore/go_mod_tidy_hack.go b/datastore/go_mod_tidy_hack.go
new file mode 100644
index 0000000..376c518
--- /dev/null
+++ b/datastore/go_mod_tidy_hack.go
@@ -0,0 +1,22 @@
+// Copyright 2019 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file, and the cloud.google.com/go import, won't actually become part of
+// the resultant binary.
+// +build modhack
+
+package datastore
+
+// Necessary for safely adding multi-module repo. See: https://github.com/golang/go/wiki/Modules#is-it-possible-to-add-a-module-to-a-multi-module-repository
+import _ "cloud.google.com/go"
diff --git a/logging/go_mod_tidy_hack.go b/logging/go_mod_tidy_hack.go
index fbf1599..a932c70 100644
--- a/logging/go_mod_tidy_hack.go
+++ b/logging/go_mod_tidy_hack.go
@@ -14,7 +14,7 @@
 
 // This file, and the cloud.google.com/go import, won't actually become part of
 // the resultant binary.
-// +build ignore
+// +build modhack
 
 package logging