diff --git a/.travis.yml b/.travis.yml
index f7e0703e..3522bb59 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,7 @@ branches:
 # library, I'm not going to worry about older versions for now.
 go:
   - tip
+  - 1.12.x
   - 1.11.x
   - 1.10.x
   - 1.9.x
diff --git a/go.mod b/go.mod
index d702af13..8261fa13 100644
--- a/go.mod
+++ b/go.mod
@@ -1 +1,3 @@
 module github.com/magefile/mage
+
+go 1.12
diff --git a/mage/testdata/mixed_lib_files/magefile.go b/mage/testdata/mixed_lib_files/magefile.go
index e9604289..3c30feba 100644
--- a/mage/testdata/mixed_lib_files/magefile.go
+++ b/mage/testdata/mixed_lib_files/magefile.go
@@ -2,7 +2,7 @@
 
 package main
 
-import "./subdir"
+import "github.com/magefile/mage/mage/testdata/mixed_lib_files/subdir"
 
 func Build() {
 	subdir.Build()