diff --git a/src/endpoints/bettwaage.py b/src/endpoints/bettwaage.py
index 1381ff2..dfd5141 100644
--- a/src/endpoints/bettwaage.py
+++ b/src/endpoints/bettwaage.py
@@ -16,8 +16,8 @@ scale_values = [1, 1, 1, 1]
 
 
 def add_line_to_history(line: str) -> None:
-    with open(file_path, "+a", encoding="UTF-8") as fp:
-        fp.write(line)
+    with open(file_path, "a", encoding="UTF-8") as fp:
+        fp.write(line + "\n")
 
 
 def convert_to_weight(value: int, zero_value: int, scale: float) -> float: