diff --git a/src/header/inttypes/cbindgen.toml b/src/header/inttypes/cbindgen.toml
index 568f0cd552..b8c2b7e93b 100644
--- a/src/header/inttypes/cbindgen.toml
+++ b/src/header/inttypes/cbindgen.toml
@@ -4,8 +4,10 @@
 # - "The <inttypes.h> header shall include the <stdint.h> header."
 # - "wchar_t As described in <stddef.h>."
 #
-# wchar.h brings in both stdint.h and stddef.h
-sys_includes = ["wchar.h"]
+# Include stdint.h and stddef.h directly per POSIX spec.
+# Do NOT include wchar.h — it creates a circular dependency:
+#   wchar.h → stdint.h → gnulib inttypes.h → inttypes.h → wchar.h
+sys_includes = ["stdint.h", "stddef.h"]
 include_guard = "_RELIBC_INTTYPES_H"
 trailer = """
 #ifndef _RELIBC_BITS_INTTYPES_H