diff --git a/ngxtop/config_parser.py b/ngxtop/config_parser.py
index f6999cf..7c0d79a 100644
--- a/ngxtop/config_parser.py
+++ b/ngxtop/config_parser.py
@@ -106,7 +106,7 @@ def detect_log_config(arguments):
 
     log_formats = dict(get_log_formats(config_str))
     if len(access_logs) == 1:
-        log_path, format_name = access_logs.items()[0]
+        log_path, format_name = list(access_logs.items())[0]
         if format_name == 'combined':
             return log_path, LOG_FORMAT_COMBINED
         if format_name not in log_formats:
@@ -115,7 +115,7 @@ def detect_log_config(arguments):
 
     # multiple access logs configured, offer to select one
     print('Multiple access logs detected in configuration:')
-    log_path = choose_one(access_logs.keys(), 'Select access log file to process: ')
+    log_path = choose_one(list(access_logs.keys()), 'Select access log file to process: ')
     format_name = access_logs[log_path]
     if format_name not in log_formats:
         error_exit('Incorrect format name set in config for access log file "%s"' % log_path)
diff --git a/ngxtop/ngxtop.py b/ngxtop/ngxtop.py
old mode 100755
new mode 100644
diff --git a/ngxtop/utils.py b/ngxtop/utils.py
index ef61072..7bd9a2a 100644
--- a/ngxtop/utils.py
+++ b/ngxtop/utils.py
@@ -5,6 +5,8 @@ def choose_one(choices, prompt):
     for idx, choice in enumerate(choices):
         print('%d. %s' % (idx + 1, choice))
     selected = None
+    if sys.version[0] == '3':
+        raw_input = input
     while not selected or selected <= 0 or selected > len(choices):
         selected = raw_input(prompt)
         try:
@@ -16,4 +18,4 @@ def choose_one(choices, prompt):
 
 def error_exit(msg, status=1):
     sys.stderr.write('Error: %s\n' % msg)
-    sys.exit(status)
\ No newline at end of file
+    sys.exit(status)