diff --git a/includes/class-signature.php b/includes/class-signature.php
index 5caf884..f78b87d 100644
--- a/includes/class-signature.php
+++ b/includes/class-signature.php
@@ -70,7 +70,7 @@ class Signature {
 		\update_user_meta( $user_id, 'magic_sig_public_key', $detail['key'] );
 	}
 
-	public static function generate_signature( $user_id, $url, $date, $digest = null ) {
+	public static function generate_signature( $user_id, $http_method, $url, $date, $digest = null ) {
 		$key = self::get_private_key( $user_id );
 
 		$url_parts = \wp_parse_url( $url );
@@ -89,9 +89,9 @@ class Signature {
 		}
 
 		if ( ! empty( $digest ) ) {
-			$signed_string = "(request-target): post $path\nhost: $host\ndate: $date\ndigest: SHA-256=$digest";
+			$signed_string = "(request-target): $http_method $path\nhost: $host\ndate: $date\ndigest: SHA-256=$digest";
 		} else {
-			$signed_string = "(request-target): post $path\nhost: $host\ndate: $date";
+			$signed_string = "(request-target): $http_method $path\nhost: $host\ndate: $date";
 		}
 
 		$signature = null;
diff --git a/includes/functions.php b/includes/functions.php
index 1c1470f..1b1269c 100644
--- a/includes/functions.php
+++ b/includes/functions.php
@@ -35,7 +35,7 @@ function get_context() {
 function safe_remote_post( $url, $body, $user_id ) {
 	$date = \gmdate( 'D, d M Y H:i:s T' );
 	$digest = \Activitypub\Signature::generate_digest( $body );
-	$signature = \Activitypub\Signature::generate_signature( $user_id, $url, $date, $digest );
+	$signature = \Activitypub\Signature::generate_signature( $user_id, 'post', $url, $date, $digest );
 
 	$wp_version = \get_bloginfo( 'version' );
 	$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );
@@ -63,7 +63,7 @@ function safe_remote_post( $url, $body, $user_id ) {
 
 function safe_remote_get( $url, $user_id ) {
 	$date = \gmdate( 'D, d M Y H:i:s T' );
-	$signature = \Activitypub\Signature::generate_signature( $user_id, $url, $date );
+	$signature = \Activitypub\Signature::generate_signature( $user_id, 'get', $url, $date );
 
 	$wp_version = \get_bloginfo( 'version' );
 	$user_agent = \apply_filters( 'http_headers_useragent', 'WordPress/' . $wp_version . '; ' . \get_bloginfo( 'url' ) );