diff --git a/src/language_service/scanner.rs b/src/language_service/scanner.rs
index e2dab7c..2973cb8 100644
--- a/src/language_service/scanner.rs
+++ b/src/language_service/scanner.rs
@@ -19,7 +19,7 @@ fn document_tree_walk<'a>(
             let first = words.next()?.to_ascii_lowercase();
 
             if let Some(token) = reserved_words.map.get(&first) {
-                if token == &TOKEN_INCLUDE {
+                if token == &TOKEN_INCLUDE || token == &TOKEN_INCLUDE_ONCE {
                     let mut include_path = words.collect::<String>();
 
                     if include_path.ends_with('}') {
diff --git a/src/utils/compiler_const.rs b/src/utils/compiler_const.rs
index 01111ef..77b4505 100644
--- a/src/utils/compiler_const.rs
+++ b/src/utils/compiler_const.rs
@@ -1,5 +1,6 @@
 // from compiler.ini
 pub const TOKEN_INCLUDE: i32 = 103;
+pub const TOKEN_INCLUDE_ONCE: i32 = 109;
 pub const TOKEN_CONST: i32 = 65;
 pub const TOKEN_END: i32 = 255;
 pub const TOKEN_INT: i32 = 1;