diff --git a/Classes/PHPExcel/Calculation.php b/Classes/PHPExcel/Calculation.php
index ee64189f..8a1b8db9 100644
--- a/Classes/PHPExcel/Calculation.php
+++ b/Classes/PHPExcel/Calculation.php
@@ -66,7 +66,7 @@ class PHPExcel_Calculation {
 	//	Function
 	const CALCULATION_REGEXP_FUNCTION	= '@?([A-Z][A-Z0-9\.]*)[\s]*\(';
 	//	Cell reference (cell or range of cells, with or without a sheet reference)
-	const CALCULATION_REGEXP_CELLREF	= '(((\w*)|(\'[^\']*\')|(\"[^\"]*\"))!)?\$?([a-z]{1,3})\$?(\d+)';
+	const CALCULATION_REGEXP_CELLREF	= '((((?:\P{M}\p{M}*)+?)|(\'[^\']*\')|(\"[^\"]*\"))!)?\$?([a-z]{1,3})\$?(\d+)';
 	//	Named Range of cells
 	const CALCULATION_REGEXP_NAMEDRANGE	= '(((\w*)|(\'.*\')|(\".*\"))!)?([_A-Z][_A-Z0-9]*)';
 	//	Error
diff --git a/changelog.txt b/changelog.txt
index 571234a1..d437d936 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -52,6 +52,7 @@ Fixed in SVN:
                      These leading characters are most commonly associated with number, currency or accounting (or occasionally fraction) formats
 - Bugfix:   (MBaker) Workitem 14374 - BUG : Excel5 and setReadFilter ?
 - Bugfix:   (MBaker) Workitem 14425 - Wrong exception message while deleting column
+- Bugfix:   (MBaker) Workitem 14679 - Formula evaluation fails with Japanese sheet refs
 - General:  (MBaker) Applied patch 6609 - Removes a unnecessary loop through each cell when applying conditional formatting to a range.
 - General:  (MBaker) Applied patch 7169 - Removed spurious PHP end tags (?>)
 - General:  (MBaker) Improved performance specifically for the Excel5 and Excel2007 Writers, but also some general improvement for all Writers