diff --git a/libc/kernel/uapi/linux/dpll.h b/libc/kernel/uapi/linux/dpll.h
index 9b5f37d..cbefd15 100644
--- a/libc/kernel/uapi/linux/dpll.h
+++ b/libc/kernel/uapi/linux/dpll.h
@@ -98,6 +98,7 @@
   DPLL_A_PIN_PHASE_ADJUST_MAX,
   DPLL_A_PIN_PHASE_ADJUST,
   DPLL_A_PIN_PHASE_OFFSET,
+  DPLL_A_PIN_FRACTIONAL_FREQUENCY_OFFSET,
   __DPLL_A_PIN_MAX,
   DPLL_A_PIN_MAX = (__DPLL_A_PIN_MAX - 1)
 };