diff --git a/libc/kernel/uapi/linux/pps.h b/libc/kernel/uapi/linux/pps.h
index 9db9242..4bfe30d 100644
--- a/libc/kernel/uapi/linux/pps.h
+++ b/libc/kernel/uapi/linux/pps.h
@@ -29,6 +29,11 @@
   __s32 nsec;
   __u32 flags;
 };
+struct pps_ktime_compat {
+  __s64 sec;
+  __s32 nsec;
+  __u32 flags;
+} __attribute__((packed, aligned(4)));
 #define PPS_TIME_INVALID (1 << 0)
 struct pps_kinfo {
   __u32 assert_sequence;
@@ -37,6 +42,13 @@
   struct pps_ktime clear_tu;
   int current_mode;
 };
+struct pps_kinfo_compat {
+  __u32 assert_sequence;
+  __u32 clear_sequence;
+  struct pps_ktime_compat assert_tu;
+  struct pps_ktime_compat clear_tu;
+  int current_mode;
+};
 struct pps_kparams {
   int api_version;
   int mode;
@@ -61,6 +73,10 @@
   struct pps_kinfo info;
   struct pps_ktime timeout;
 };
+struct pps_fdata_compat {
+  struct pps_kinfo_compat info;
+  struct pps_ktime_compat timeout;
+};
 struct pps_bind_args {
   int tsformat;
   int edge;