diff --git a/jac/jaclang/compiler/__init__.py b/jac/jaclang/compiler/__init__.py
index d1b178b4fe..804e78470f 100644
--- a/jac/jaclang/compiler/__init__.py
+++ b/jac/jaclang/compiler/__init__.py
@@ -68,7 +68,7 @@ def generate_static_parser(force: bool = False) -> None:
         "STAR_POW_EQ": "**=", "MUL_EQ": "*=", "FLOOR_DIV_EQ": "//=",
         "DIV_EQ": "/=", "MOD_EQ": "%=", "BW_AND_EQ": "&=",
         "BW_OR_EQ": "|=", "BW_XOR_EQ": "^=", "BW_NOT_EQ": "~=",
-        "LSHIFT_EQ": "<<=", "RSHIFT_EQ": ">>=", "ELLIPSIS": "...",
+        "LSHIFT_EQ": "<<=", "RSHIFT_EQ": ">>=", "ELLIPSIS": "...", "KW_IN": "in",
     }
 )
 # fmt: on