diff --git a/includes/classes/Connection.php b/includes/classes/Connection.php
index ee06ced51..9e22f5441 100644
--- a/includes/classes/Connection.php
+++ b/includes/classes/Connection.php
@@ -48,7 +48,7 @@ abstract public function remote_get( $args );
 	 * @param boolean $overwrite Whether to overwrite the sync log. Optional.
 	 * @since 0.8
 	 */
-	abstract public function log_sync( array $item_id_mappings, $id, bool $overwrite );
+	abstract public function log_sync( array $item_id_mappings, $id, $overwrite );
 
 	/**
 	 * Get the sync log
diff --git a/tests/php/includes/common.php b/tests/php/includes/common.php
index 9c3978bba..fc019af73 100644
--- a/tests/php/includes/common.php
+++ b/tests/php/includes/common.php
@@ -284,7 +284,7 @@ public function pull( $items ) { }
 
 	public function remote_get( $args ) { }
 
-	public function log_sync( array $item_id_mappings, $id, bool $overwrite ) {}
+	public function log_sync( array $item_id_mappings, $id, $overwrite ) {}
 
 	public function get_sync_log( $id ) {}