diff --git a/pydiffchecker/line_shift_checker.py b/pydiffchecker/line_shift_checker.py
index e4644a0..c242588 100644
--- a/pydiffchecker/line_shift_checker.py
+++ b/pydiffchecker/line_shift_checker.py
@@ -29,7 +29,7 @@ class ShiftedLines(Sized, Iterable):
 
 class LineShiftChecker:
     SUBMODULE_MODE = '160000'
-    DIFF_BLOCK_REGEX = r'@@ -(\d+),(\d+) \+(\d+),(\d+) @@'
+    DIFF_BLOCK_REGEX = r'@@ -(\d+)(?:,\d+)? \+(\d+)(?:,\d+)? @@'
 
     def __init__(self, revision_since: str, revision_until: str) -> None:
         self.revision_since = revision_since