diff --git a/.gitignore b/.gitignore
index ed3ff7b..93318c3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,5 @@ doc/modules
 tmp/
 *.xtcindex
 .spyproject/
+/test/data/water/.traj.xtc_offsets.lock
+/test/data/water/.traj.xtc_offsets.npz