diff --git a/tests/test_image.py b/tests/test_image.py
index f67cdc248c6909530dd18cba72bf18b311485f09..62a665070fef0d6fbdf259d81b5ccc5f91a0385f 100644
--- a/tests/test_image.py
+++ b/tests/test_image.py
@@ -112,7 +112,7 @@ def test_looksLikeImage():
 
 def test_addExt(testdir):
 
-    default = fslimage.DEFAULT_EXTENSION
+    default = fslimage.defaultExt()
 
     # (file, mustExist, expected)
     tests = [