diff --git a/km3buu/__init__.py b/km3buu/__init__.py
index 95b9af090cf6af54b3f8f44e6cffda2131dac284..b2281c9048b883f908cb5eb08173ea6c1e5605bd 100644
--- a/km3buu/__init__.py
+++ b/km3buu/__init__.py
@@ -2,8 +2,10 @@ from .__version__ import version
 
 from os.path import isfile, abspath, join, dirname
 
-image_path = abspath(join(dirname(__file__), "..", "GiBUU.simg"))
-if not isfile(image_path):
+MODULE_PATH = abspath(join(dirname(__file__), ".."))
+IMAGE_PATH = join(MODULE_PATH, "GiBUU.simg")
+
+if not isfile(IMAGE_PATH):
     raise EnvironmentError(
         "GiBUU image was not found at %s; please run `make build` or `make buildremote`"
-        % image_path)
+        % IMAGE_PATH)