diff --git a/invesalius/gui/task_navigator.py b/invesalius/gui/task_navigator.py
index 04b3c2e..21cc2e2 100644
--- a/invesalius/gui/task_navigator.py
+++ b/invesalius/gui/task_navigator.py
@@ -31,7 +31,7 @@ try:
     import Trekker
     has_trekker = True
 except ImportError:
-    has_trekker = True
+    has_trekker = False
 
 try:
     import invesalius.data.elfin as elfin
--
libgit2 0.21.2