diff --git a/wp-includes/class-snoopy.php b/wp-includes/class-snoopy.php
index d64f98aae7..2c59c48112 100644
--- a/wp-includes/class-snoopy.php
+++ b/wp-includes/class-snoopy.php
@@ -1010,7 +1010,7 @@ class Snoopy
 		if($this->read_timeout > 0)
 			$cmdline_params .= " -m ".$this->read_timeout;
 
-		$headerfile = tempnam($temp_dir, "sno");
+		$headerfile = tempnam($this->temp_dir, "sno");
 
 		exec($this->curl_path." -k -D \"$headerfile\"".$cmdline_params." \"".escapeshellcmd($URI)."\"",$results,$return);