diff --git a/montepy/utilities.py b/montepy/utilities.py
index 05e3b1af..e167dfef 100644
--- a/montepy/utilities.py
+++ b/montepy/utilities.py
@@ -45,12 +45,10 @@ def is_comment(line):
     non_blank_comment = upper_start and line.lstrip().upper().startswith("C ")
     if non_blank_comment:
         return True
-    blank_comment = (
-        "C\n" == upper_start.lstrip()
-        or "C\r\n" == upper_start.lstrip()
-        or ("C" == upper_start and "\n" not in line)
+    blank_comment = ("C" == upper_start.strip() and "\n" in line) or (
+        "C" == upper_start and "\n" not in line
     )
-    return blank_comment or non_blank_comment
+    return blank_comment
 
 
 def make_prop_val_node(