diff --git a/src/main/java/device/usbPlayer/UsbPlayer.java b/src/main/java/device/usbPlayer/UsbPlayer.java
index 2dac1b0..1ce300d 100644
--- a/src/main/java/device/usbPlayer/UsbPlayer.java
+++ b/src/main/java/device/usbPlayer/UsbPlayer.java
@@ -76,7 +76,7 @@ public class UsbPlayer implements Device {
 
         for (int i = 0; i < Playlist.size(); i++) {
             song = Playlist.get(i).substring(Playlist.get(i).length() - 4);
-            if (song.equals(".mp3") | song.equals(".mp4")| song.equals(".m4a") ) {
+            if (song.equals(".mp3") | song.equals(".mp4")| song.equals(".m4a")| song.equals(".wav") ) {
                 flag = true;
             } else {
                 flag = false;
diff --git a/src/test/java/device/usbPlayer/UsbPlayerTest.java b/src/test/java/device/usbPlayer/UsbPlayerTest.java
index 8999478..0d5b6ca 100644
--- a/src/test/java/device/usbPlayer/UsbPlayerTest.java
+++ b/src/test/java/device/usbPlayer/UsbPlayerTest.java
@@ -267,19 +267,19 @@ class UsbPlayerTest {
         Pl1.add("Musik 01.m4a");
         Pl1.add("Musik 02.m4a");
         Pl1.add("Musik 03.m4a");
-        up3.setPlaylist(Pl);
+        up3.setPlaylist(Pl1);
         //Flac
         UsbPlayer up4 = new UsbPlayer();
         ArrayList<String> Pl2 = new ArrayList<String>();
-        Pl2.add("Musik 01.flac");
-        Pl2.add("Musik 02.flac");
-        Pl2.add("Musik 03.flac");
-        up4.setPlaylist(Pl);
+        Pl2.add("Musik 01.wav");
+        Pl2.add("Musik 02.wav");
+        Pl2.add("Musik 03.wav");
+        up4.setPlaylist(Pl2);
         return Stream.of(
                 Arguments.of("Check if the Files are .mp3 ", up1.isAllAudio(), true),
                 Arguments.of("Check if the Files are .mp4 ", up2.isAllAudio(), true),
                 Arguments.of("Check if the Files are .m4a ", up3.isAllAudio(), true),
-                Arguments.of("Check if the Files are .flac ", up4.isAllAudio(), true)
+                Arguments.of("Check if the Files are .wav ", up4.isAllAudio(), true)
 
         );
     }