diff --git a/index.php b/index.php
index 03cb861..87e9d0e 100644
--- a/index.php
+++ b/index.php
@@ -48,7 +48,8 @@
 
 	//	Get the type of request - used in the log filename
 	if ( isset( $body["type"] ) ) {
-		$type = " " . $body["type"];
+		//	Sanitise type to only include letter
+		$type = " " . preg_replace( '/[^a-zA-Z]/', '', $body["type"] );
 	} else {
 		$type = "";
 	}