diff --git a/iconmaker/converter.py b/iconmaker/converter.py
index 501b2a2..eda9515 100644
--- a/iconmaker/converter.py
+++ b/iconmaker/converter.py
@@ -1,13 +1,13 @@
 import subprocess, os, tempfile, requests, struct
 
 try:
-    from cStringIO import StringIO
+    from io import StringIO
 except:
-    from StringIO import StringIO
+    from io import StringIO
 
-from utils import check_and_get_image_sizes, which, image_mode_to_bit_depth
-from logger import logging
-from exceptions import ConversionError, ImageError
+from .utils import check_and_get_image_sizes, which, image_mode_to_bit_depth
+from .logger import logging
+from .exceptions import ConversionError, ImageError
 from PIL import Image
 
 FORMAT_PNG = 'png'
@@ -452,7 +452,7 @@ def convert(self,
 
         image_list = []
         resized_images = {}
-        for (image_size, image_path) in image_dict.iteritems():
+        for (image_size, image_path) in image_dict.items():
             (image_width, image_height) = image_size
 
             if not is_size_convertible_to_icon(image_width,
diff --git a/iconmaker/utils.py b/iconmaker/utils.py
index 6546da3..c81666d 100644
--- a/iconmaker/utils.py
+++ b/iconmaker/utils.py
@@ -1,6 +1,6 @@
 import os
 from PIL import Image
-from exceptions import ImageError
+from .exceptions import ImageError
 
 
 def check_and_get_image_sizes(image_list):