diff --git a/Makefile b/Makefile
index efacfdb..c4ba4f1 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,3 @@
-# Should contain src/github.com/Kagami/go-face or tests won't work
-# properly (multiple definition of C functions).
-export GOPATH = $(PWD)/../../../..
-
 all: test
 precommit: gofmt-staged
 
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..3e5810a
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/Kagami/go-face
+
+go 1.14