diff --git a/src/abstract_tree/identifier.rs b/src/abstract_tree/identifier.rs
index 9b18de9..88b8bea 100644
--- a/src/abstract_tree/identifier.rs
+++ b/src/abstract_tree/identifier.rs
@@ -22,6 +22,8 @@ impl Identifier {
 
 impl AbstractTree for Identifier {
     fn from_syntax_node(source: &str, node: Node) -> Result<Self> {
+        debug_assert_eq!("identifier", node.kind());
+
         let identifier = &source[node.byte_range()];
 
         Ok(Identifier(identifier.to_string()))