diff --git a/src/helper_msgcoding.py b/src/helper_msgcoding.py
index 76dad423..8c1cfafe 100644
--- a/src/helper_msgcoding.py
+++ b/src/helper_msgcoding.py
@@ -103,8 +103,8 @@ class MsgDecode(object):
         while len(tmp) <= BMConfigParser().safeGetInt("zlib", "maxsize"):
             try:
                 got = dc.decompress(
-                    data, BMConfigParser().safeGetInt("zlib", "maxsize") +
-                    1 - len(tmp))
+                    data, BMConfigParser().safeGetInt("zlib", "maxsize")
+                    + 1 - len(tmp))
                 # EOF
                 if got == "":
                     break