diff --git a/epub.php b/epub.php
index e56b0b6..13eeec3 100644
--- a/epub.php
+++ b/epub.php
@@ -19,10 +19,17 @@
 
 	function write_epub($epub)
 	{
-		if ( ! $epub->error ) {
+		if (file_exists($epub->epub_file))
+		{
+			unlink($epub->epub_file);
+		}
+
+		if (!$epub->error)
+		{
 			$epub->CreateEPUB();
 
-			if ( ! $epub->error ) {
+			if (!$epub->error)
+			{
 				echo 'Success: <a href="' . $epub->epub_file . '">' . $epub->epub_file . '</a> created.<br>';
 			}
 			else
@@ -30,7 +37,9 @@
 				echo $epub->error;
 			}
 
-		} else {
+		}
+		else
+		{
 			echo $epub->error;
 		}
 	}