diff --git a/safeeyes/Utility.py b/safeeyes/Utility.py
index ddbb3da..e57edfb 100644
--- a/safeeyes/Utility.py
+++ b/safeeyes/Utility.py
@@ -47,13 +47,14 @@ def play_notification():
 
 		# Write file data into the sound stream
 		data = sound.readframes(CHUNK)
-		while data != '':
+		while data != b'':
 			stream.write(data)
 			data = sound.readframes(CHUNK)
 
 		# Close steam
 		stream.stop_stream()
 		stream.close()
+		sound.close()
 		wrapper.terminate()
 
 	except Exception as e:
@@ -100,7 +101,7 @@ def is_active_window_skipped(skip_break_window_classes, take_break_window_classe
 	cmdlist = ['xprop', '-root', '-notype','-id',active_xid, 'WM_CLASS', '_NET_WM_STATE']
 
 	try:
-		stdout = subprocess.check_output(cmdlist)
+		stdout = subprocess.check_output(cmdlist).decode('utf-8')
 	except subprocess.CalledProcessError:
 		logging.warning("Error in finding full-screen application")
 		pass
diff --git a/safeeyes/resource/alert.wav b/safeeyes/resource/alert.wav
index ec0f946..48be2e0 100644
Binary files a/safeeyes/resource/alert.wav and b/safeeyes/resource/alert.wav differ
diff --git a/safeeyes/safeeyes.py b/safeeyes/safeeyes.py
index 9d071c9..a8726c1 100755
--- a/safeeyes/safeeyes.py
+++ b/safeeyes/safeeyes.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 
 # Safe Eyes is a utility to remind you to take break frequently
 # to protect your eyes from eye strain.
@@ -244,7 +244,7 @@ def running():
 	'''
 	process_count = 0
 	for proc in psutil.process_iter():
-	 	try:
+		try:
 			# Check if safeeyes is in process arguments
 			cmd_line = proc.cmdline()
 			if 'python2' == cmd_line[0] and 'safeeyes' in cmd_line[1]: