diff --git a/chgnet/utils/vasp_utils.py b/chgnet/utils/vasp_utils.py
index cbe909cd..82ee659c 100644
--- a/chgnet/utils/vasp_utils.py
+++ b/chgnet/utils/vasp_utils.py
@@ -61,7 +61,7 @@ def parse_vasp_dir(
     charge, mag_x, mag_y, mag_z, header = [], [], [], [], []
 
     with zopen(outcar_path, encoding="utf-8") as file:
-        all_lines = [line.strip() for line in file]
+        all_lines = [line.strip() for line in file.readlines()]
 
     # For single atom systems, VASP doesn't print a total line, so
     # reverse parsing is very difficult