diff --git a/parsedmarc/utils.py b/parsedmarc/utils.py
index de42e7c..5be154d 100644
--- a/parsedmarc/utils.py
+++ b/parsedmarc/utils.py
@@ -395,6 +395,8 @@ def get_filename_safe_string(string):
         string = string.replace(char, "")
     string = string.rstrip(".")
 
+    string = (string[:100]) if len(string) > 100 else string
+
     return string