diff --git a/CHANGELOG.md b/CHANGELOG.md
index 96574fe7..20819876 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - Fix number format masks containing named colours that were being misinterpreted as date formats; and add support for masks that fully replace the value with a full text string [Issue #1009](https://github.com/PHPOffice/PhpSpreadsheet/issues/1009) 
 - Stricter-typed comparison testing in COUNTIF() and COUNTIFS() evaluation [Issue #1046](https://github.com/PHPOffice/PhpSpreadsheet/issues/1046)
 - COUPNUM should not return zero when settlement is in the last period - [Issue #1020](https://github.com/PHPOffice/PhpSpreadsheet/issues/1020) and [PR #1021](https://github.com/PHPOffice/PhpSpreadsheet/pull/1021)
+- Fix handling of named ranges referencing sheets with spaces or "!" in their title
 
 ## [1.8.2] - 2019-07-08
 
diff --git a/src/PhpSpreadsheet/Spreadsheet.php b/src/PhpSpreadsheet/Spreadsheet.php
index 8eadcbe8..04a9f1df 100644
--- a/src/PhpSpreadsheet/Spreadsheet.php
+++ b/src/PhpSpreadsheet/Spreadsheet.php
@@ -721,7 +721,7 @@ class Spreadsheet
     {
         $worksheetCount = count($this->workSheetCollection);
         for ($i = 0; $i < $worksheetCount; ++$i) {
-            if ($this->workSheetCollection[$i]->getTitle() === $pName) {
+            if ($this->workSheetCollection[$i]->getTitle() === trim($pName, "'")) {
                 return $this->workSheetCollection[$i];
             }
         }
diff --git a/tests/PhpSpreadsheetTests/Worksheet/WorksheetTest.php b/tests/PhpSpreadsheetTests/Worksheet/WorksheetTest.php
index 46df9405..ce2df837 100644
--- a/tests/PhpSpreadsheetTests/Worksheet/WorksheetTest.php
+++ b/tests/PhpSpreadsheetTests/Worksheet/WorksheetTest.php
@@ -137,6 +137,7 @@ class WorksheetTest extends TestCase
             ['B2', '', '', 'B2'],
             ['testTitle!B2', 'testTitle', 'B2', 'B2'],
             ['test!Title!B2', 'test!Title', 'B2', 'B2'],
+            ['test Title!B2', 'test Title', 'B2', 'B2'],
         ];
     }
 
diff --git a/tests/data/Calculation/Functions/ISFORMULA.php b/tests/data/Calculation/Functions/ISFORMULA.php
index 9e0d0d0b..60d9c07f 100644
--- a/tests/data/Calculation/Functions/ISFORMULA.php
+++ b/tests/data/Calculation/Functions/ISFORMULA.php
@@ -81,4 +81,14 @@ return [
         '\'Worksheet1\'!A16',
         '123',
     ],
+    [
+        true,
+        'A17',
+        '=\'Work sheet1\'!A1',
+    ],
+    [
+        true,
+        'A18',
+        '=\'Work!sheet1\'!A1',
+    ],
 ];
diff --git a/tests/data/Calculation/LookupRef/FORMULATEXT.php b/tests/data/Calculation/LookupRef/FORMULATEXT.php
index 30b2d6eb..48d528bf 100644
--- a/tests/data/Calculation/LookupRef/FORMULATEXT.php
+++ b/tests/data/Calculation/LookupRef/FORMULATEXT.php
@@ -21,11 +21,26 @@ return [
         'A4',
         '=\'Worksheet1\'!A1',
     ],
+    [
+        '=\'Works heet1\'!A1',
+        'A4',
+        '=\'Works heet1\'!A1',
+    ],
     [
         '="HELLO WORLD"',
         '\'Worksheet1\'!A5',
         '="HELLO WORLD"',
     ],
+    [
+        '="HELLO WORLD"',
+        '\'Work sheet1\'!A5',
+        '="HELLO WORLD"',
+    ],
+    [
+        '="HELLO WORLD"',
+        '\'Work!sheet1\'!A5',
+        '="HELLO WORLD"',
+    ],
     [
         '#N/A',
         '\'Worksheet1\'!A6',