diff --git a/src/Spout/Writer/CSV/Writer.php b/src/Spout/Writer/CSV/Writer.php
index 4327902..a7e72fe 100644
--- a/src/Spout/Writer/CSV/Writer.php
+++ b/src/Spout/Writer/CSV/Writer.php
@@ -66,6 +66,10 @@ class Writer extends AbstractWriter
         $this->globalFunctionsHelper->fputs($this->filePointer, EncodingHelper::BOM_UTF8);
     }
 
+    public function registerStyle($style) {
+        return false;
+    }
+
     /**
      * Adds data to the currently opened writer.
      *
diff --git a/src/Spout/Writer/Common/Internal/AbstractWorkbook.php b/src/Spout/Writer/Common/Internal/AbstractWorkbook.php
index ca16a29..c8f9f9f 100644
--- a/src/Spout/Writer/Common/Internal/AbstractWorkbook.php
+++ b/src/Spout/Writer/Common/Internal/AbstractWorkbook.php
@@ -167,11 +167,6 @@ abstract class AbstractWorkbook implements WorkbookInterface
         }
     }
 
-    public function applyStyleToCurrentWorksheet($style) {
-        $updatedStyle = $styleHelper->applyExtraStylesIfNeeded($style, array());
-        $registeredStyle = $styleHelper->registerStyle($updatedStyle);
-    }
-
     /**
      * @return bool Whether the current worksheet has reached the maximum number of rows per sheet.
      */
diff --git a/src/Spout/Writer/ODS/Writer.php b/src/Spout/Writer/ODS/Writer.php
index 4b35dfd..68e8972 100644
--- a/src/Spout/Writer/ODS/Writer.php
+++ b/src/Spout/Writer/ODS/Writer.php
@@ -61,6 +61,10 @@ class Writer extends AbstractMultiSheetsWriter
         return $this->book;
     }
 
+    public function registerStyle($style) {
+        return false;
+    }
+
     /**
      * Adds data to the currently opened writer.
      * If shouldCreateNewSheetsAutomatically option is set to true, it will handle pagination
diff --git a/test.php b/test.php
index a7fbdbf..4652fc7 100644
--- a/test.php
+++ b/test.php
@@ -5,7 +5,6 @@ include_once 'src/Spout/Autoloader/autoload.php';
 use Box\Spout\Common\Type;
 use Box\Spout\Writer\WriterFactory;
 use Box\Spout\Writer\Style\StyleBuilder;
-use Box\Spout\Writer\Style\Color;
 
 # UNIX_DATE = (EXCEL_DATE - 25569) * 86400              : Excel -> unix
 # EXCEL_DATE = 25569 + (UNIX_DATE / 86400)              : Unix -> excel