diff --git a/CHANGELOG.md b/CHANGELOG.md
index 83d2bb22..e50faf41 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Fixed
 
+- Formula Parser: Wrong line count for stuff like "MyOtherSheet!A:D" [#1215](https://github.com/PHPOffice/PhpSpreadsheet/issues/1215)
 - Call garbage collector after removing a column to prevent stale cached values
 - Trying to remove a column that doesn't exist deletes the latest column
 
diff --git a/src/PhpSpreadsheet/Calculation/Calculation.php b/src/PhpSpreadsheet/Calculation/Calculation.php
index 2d63a939..93d7058d 100644
--- a/src/PhpSpreadsheet/Calculation/Calculation.php
+++ b/src/PhpSpreadsheet/Calculation/Calculation.php
@@ -3647,6 +3647,7 @@ class Calculation
                     if ($testPrevOp !== null && $testPrevOp['value'] === ':') {
                         $startRowColRef = $output[count($output) - 1]['value'];
                         [$rangeWS1, $startRowColRef] = Worksheet::extractSheetTitle($startRowColRef, true);
+                        $rangeSheetRef = $rangeWS1;
                         if ($rangeWS1 != '') {
                             $rangeWS1 .= '!';
                         }
@@ -3656,16 +3657,20 @@ class Calculation
                         } else {
                             $rangeWS2 = $rangeWS1;
                         }
+                        $refSheet = $pCellParent;
+                        if ($rangeSheetRef !== $pCellParent->getTitle()) {
+                            $refSheet = $pCell->getWorksheet()->getParent()->getSheetByName($rangeSheetRef);
+                        }
                         if ((is_int($startRowColRef)) && (ctype_digit($val)) &&
                             ($startRowColRef <= 1048576) && ($val <= 1048576)) {
                             //    Row range
-                            $endRowColRef = ($pCellParent !== null) ? $pCellParent->getHighestColumn() : 'XFD'; //    Max 16,384 columns for Excel2007
+                            $endRowColRef = ($refSheet !== null) ? $refSheet->getHighestColumn() : 'XFD'; //    Max 16,384 columns for Excel2007
                             $output[count($output) - 1]['value'] = $rangeWS1 . 'A' . $startRowColRef;
                             $val = $rangeWS2 . $endRowColRef . $val;
                         } elseif ((ctype_alpha($startRowColRef)) && (ctype_alpha($val)) &&
                             (strlen($startRowColRef) <= 3) && (strlen($val) <= 3)) {
                             //    Column range
-                            $endRowColRef = ($pCellParent !== null) ? $pCellParent->getHighestRow() : 1048576; //    Max 1,048,576 rows for Excel2007
+                            $endRowColRef = ($refSheet !== null) ? $refSheet->getHighestRow() : 1048576; //    Max 1,048,576 rows for Excel2007
                             $output[count($output) - 1]['value'] = $rangeWS1 . strtoupper($startRowColRef) . '1';
                             $val = $rangeWS2 . $val . $endRowColRef;
                         }