Index: wp-includes/http.php
===================================================================
--- wp-includes/http.php	(revision 11239)
+++ wp-includes/http.php	(working copy)
@@ -1787,7 +1787,7 @@
 		if ( false !== $decompressed )
 			return $decompressed;
 
-		$decompressed = gzdecode( $compressed );
+		$decompressed = gzdeflate( $compressed );
 
 		if ( false !== $decompressed )
 			return $decompressed;
@@ -1810,7 +1810,7 @@
 		if ( function_exists( 'gzuncompress' ) )
 			$type[] = 'compress;q=0.5';
 
-		if ( function_exists( 'gzdecode' ) )
+		if ( function_exists( 'gzdeflate' ) )
 			$type[] = 'gzip;q=0.5';
 
 		return implode(', ', $type);