diff --git a/src/wp-includes/canonical.php b/src/wp-includes/canonical.php
index b9547d824b..a4a56ec445 100644
--- a/src/wp-includes/canonical.php
+++ b/src/wp-includes/canonical.php
@@ -39,6 +39,10 @@
 function redirect_canonical( $requested_url = null, $do_redirect = true ) {
 	global $wp_rewrite, $is_IIS, $wp_query, $wpdb;
 
+	if ( isset( $_SERVER['REQUEST_METHOD'] ) && 'GET' !== $_SERVER['REQUEST_METHOD'] ) {
+		return;
+	}
+
 	// If we're not in wp-admin and the post has been published and preview nonce
 	// is non-existent or invalid then no need for preview in query
 	if ( is_preview() && get_query_var( 'p' ) && 'publish' == get_post_status( get_query_var( 'p' ) ) ) {
@@ -49,8 +53,9 @@ function redirect_canonical( $requested_url = null, $do_redirect = true ) {
 		}
 	}
 
-	if ( is_trackback() || is_search() || is_comments_popup() || is_admin() || !empty($_POST) || is_preview() || is_robots() || ( $is_IIS && !iis7_supports_permalinks() ) )
+	if ( is_trackback() || is_search() || is_comments_popup() || is_admin() || is_preview() || is_robots() || ( $is_IIS && !iis7_supports_permalinks() ) ) {
 		return;
+	}
 
 	if ( !$requested_url ) {
 		// build the URL in the address bar