diff --git a/libc/utils/hdrgen/hdrgen/header.py b/libc/utils/hdrgen/hdrgen/header.py
index 2118db6e5fb75..715d4b7c9b7ed 100644
--- a/libc/utils/hdrgen/hdrgen/header.py
+++ b/libc/utils/hdrgen/hdrgen/header.py
@@ -241,7 +241,5 @@ def json_data(self):
         return {
             "name": self.name,
             "standards": self.standards,
-            "includes": [
-                str(file) for file in sorted({COMMON_HEADER} | self.includes())
-            ],
+            "includes": sorted(str(file) for file in {COMMON_HEADER} | self.includes()),
         }