diff --git a/libc/private/bionic_futex.h b/libc/private/bionic_futex.h
index 401577a..946d9dd 100644
--- a/libc/private/bionic_futex.h
+++ b/libc/private/bionic_futex.h
@@ -40,10 +40,12 @@
 
 struct timespec;
 
-static inline __always_inline int __futex(volatile void* ftx, int op, int value, const struct timespec* timeout) {
+static inline __always_inline int __futex(volatile void* ftx, int op, int value,
+                                          const struct timespec* timeout,
+                                          int bitset) {
   // Our generated syscall assembler sets errno, but our callers (pthread functions) don't want to.
   int saved_errno = errno;
-  int result = syscall(__NR_futex, ftx, op, value, timeout);
+  int result = syscall(__NR_futex, ftx, op, value, timeout, NULL, bitset);
   if (__predict_false(result == -1)) {
     result = -errno;
     errno = saved_errno;
@@ -52,19 +54,22 @@
 }
 
 static inline int __futex_wake(volatile void* ftx, int count) {
-  return __futex(ftx, FUTEX_WAKE, count, NULL);
+  return __futex(ftx, FUTEX_WAKE, count, NULL, 0);
 }
 
 static inline int __futex_wake_ex(volatile void* ftx, bool shared, int count) {
-  return __futex(ftx, shared ? FUTEX_WAKE : FUTEX_WAKE_PRIVATE, count, NULL);
+  return __futex(ftx, shared ? FUTEX_WAKE : FUTEX_WAKE_PRIVATE, count, NULL, 0);
 }
 
 static inline int __futex_wait(volatile void* ftx, int value, const struct timespec* timeout) {
-  return __futex(ftx, FUTEX_WAIT, value, timeout);
+  return __futex(ftx, FUTEX_WAIT, value, timeout, 0);
 }
 
-static inline int __futex_wait_ex(volatile void* ftx, bool shared, int value, const struct timespec* timeout) {
-  return __futex(ftx, shared ? FUTEX_WAIT : FUTEX_WAIT_PRIVATE, value, timeout);
+static inline int __futex_wait_ex(volatile void* ftx, bool shared, int value,
+                                  bool use_realtime_clock, const struct timespec* abs_timeout) {
+  return __futex(ftx, (shared ? FUTEX_WAIT_BITSET : FUTEX_WAIT_BITSET_PRIVATE) |
+                 (use_realtime_clock ? FUTEX_CLOCK_REALTIME : 0), value, abs_timeout,
+                 FUTEX_BITSET_MATCH_ANY);
 }
 
 __END_DECLS