diff --git a/packages/deparser/scripts/keywords.ts b/packages/deparser/scripts/keywords.ts
index 46e5557b..3bd2ad68 100644
--- a/packages/deparser/scripts/keywords.ts
+++ b/packages/deparser/scripts/keywords.ts
@@ -88,10 +88,10 @@ export type KeywordKind =
 export const kwlist = ${JSON.stringify(keywordsByKind, null, 2)
     .replace(/"([A-Z_]+)"/g, "$1")} as const;
 
-export const RESERVED_KEYWORDS = new Set(kwlist.RESERVED_KEYWORD ?? []);
-export const UNRESERVED_KEYWORDS = new Set(kwlist.UNRESERVED_KEYWORD ?? []);
-export const COL_NAME_KEYWORDS = new Set(kwlist.COL_NAME_KEYWORD ?? []);
-export const TYPE_FUNC_NAME_KEYWORDS = new Set(kwlist.TYPE_FUNC_NAME_KEYWORD ?? []);
+export const RESERVED_KEYWORDS: Set<string> = new Set(kwlist.RESERVED_KEYWORD ?? []);
+export const UNRESERVED_KEYWORDS: Set<string> = new Set(kwlist.UNRESERVED_KEYWORD ?? []);
+export const COL_NAME_KEYWORDS: Set<string> = new Set(kwlist.COL_NAME_KEYWORD ?? []);
+export const TYPE_FUNC_NAME_KEYWORDS: Set<string> = new Set(kwlist.TYPE_FUNC_NAME_KEYWORD ?? []);
 
 export function keywordKindOf(word: string): KeywordKind {
   const w = word.toLowerCase();