diff --git a/cronexpr/go.mod b/cronexpr/go.mod
new file mode 100644
index 0000000..6f458ff
--- /dev/null
+++ b/cronexpr/go.mod
@@ -0,0 +1,7 @@
+module github.com/gorhill/cronexpr/cronexpr
+
+go 1.14
+
+replace github.com/gorhill/cronexpr => ../
+
+require github.com/gorhill/cronexpr v0.0.0-00010101000000-000000000000
diff --git a/cronexpr/go.sum b/cronexpr/go.sum
new file mode 100644
index 0000000..a4a51bf
--- /dev/null
+++ b/cronexpr/go.sum
@@ -0,0 +1,2 @@
+github.com/gorhill/cronexpr v0.0.0-20180427100037-88b0669f7d75 h1:f0n1xnMSmBLzVfsMMvriDyA75NB/oBgILX2GcHXIQzY=
+github.com/gorhill/cronexpr v0.0.0-20180427100037-88b0669f7d75/go.mod h1:g2644b03hfBX9Ov0ZBDgXXens4rxSxmqFBbhvKv2yVA=
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..a1c711f
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/gorhill/cronexpr
+
+go 1.14