diff --git a/lib/core/lex/lexer.h b/lib/core/lex/lexer.h
index ddba6d39..210622fe 100644
--- a/lib/core/lex/lexer.h
+++ b/lib/core/lex/lexer.h
@@ -1,4 +1,4 @@
-#pragma oonce
+#pragma once
 
 #include <functional>
 #include <vector>