diff --git a/src/PhpSpreadsheet/Cell/StringValueBinder.php b/src/PhpSpreadsheet/Cell/StringValueBinder.php
index e253e7be..6c25bda0 100644
--- a/src/PhpSpreadsheet/Cell/StringValueBinder.php
+++ b/src/PhpSpreadsheet/Cell/StringValueBinder.php
@@ -86,7 +86,7 @@ class StringValueBinder implements IValueBinder
             if ($value instanceof DateTimeInterface) {
                 $value = $value->format('Y-m-d H:i:s');
             } elseif ($value instanceof RichText) {
-                $cell->setValueExplicit((string)$value, DataType::TYPE_INLINE);
+                $cell->setValueExplicit($value, DataType::TYPE_INLINE);
 
                 return true;
             }
diff --git a/tests/PhpSpreadsheetTests/Cell/StringValueBinderTest.php b/tests/PhpSpreadsheetTests/Cell/StringValueBinderTest.php
index 1a8533aa..411af353 100644
--- a/tests/PhpSpreadsheetTests/Cell/StringValueBinderTest.php
+++ b/tests/PhpSpreadsheetTests/Cell/StringValueBinderTest.php
@@ -6,7 +6,6 @@ use DateTime;
 use DateTimeZone;
 use PhpOffice\PhpSpreadsheet\Cell\Cell;
 use PhpOffice\PhpSpreadsheet\Cell\DataType;
-use PhpOffice\PhpSpreadsheet\Cell\DefaultValueBinder;
 use PhpOffice\PhpSpreadsheet\Cell\StringValueBinder;
 use PhpOffice\PhpSpreadsheet\RichText\RichText;
 use PhpOffice\PhpSpreadsheet\Style\Style;