diff --git a/app/media/demuxer_test.go b/app/media/demuxer_test.go
index 9e60569..0145b98 100644
--- a/app/media/demuxer_test.go
+++ b/app/media/demuxer_test.go
@@ -4,6 +4,7 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 	"sync"
 	"testing"
 
@@ -13,7 +14,7 @@ import (
 func Test_Demux(t *testing.T) {
 	Convey("Demuxer", t, func() {
 		Convey("audio-only", func() {
-			reader, _ := os.Open("testassets/mpthreetest.mp3")
+			reader, _ := os.Open(filepath.Join("testassets", "mpthreetest.mp3"))
 			defer reader.Close()
 
 			demuxer := Demux(reader)
@@ -43,7 +44,7 @@ func Test_Demux(t *testing.T) {
 		})
 
 		Convey("video and audio", func() {
-			reader, _ := os.Open("testassets/small.ogv")
+			reader, _ := os.Open(filepath.Join("testassets", "small.ogv"))
 			defer reader.Close()
 
 			demuxer := Demux(reader)
diff --git a/app/media/muxer_test.go b/app/media/muxer_test.go
index c9d9b78..8dc79ec 100644
--- a/app/media/muxer_test.go
+++ b/app/media/muxer_test.go
@@ -4,6 +4,7 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
+	"path/filepath"
 	"testing"
 
 	. "github.com/smartystreets/goconvey/convey"
@@ -12,7 +13,7 @@ import (
 func Test_Muxer(t *testing.T) {
 	Convey("Muxer", t, func() {
 		Convey("audio-only", func() {
-			reader, _ := os.Open("testassets/mpthreetest.mp3")
+			reader, _ := os.Open(filepath.Join("testassets", "mpthreetest.mp3"))
 			defer reader.Close()
 
 			demuxer := Demux(reader)