diff --git a/src/internal/pthread_impl.h b/src/internal/pthread_impl.h
index 56e1934..602d6f5 100644
--- a/src/internal/pthread_impl.h
+++ b/src/internal/pthread_impl.h
@@ -136,6 +136,12 @@
 	__syscall(SYS_futex, addr, FUTEX_WAKE|priv, cnt) != -ENOSYS ||
 	__syscall(SYS_futex, addr, FUTEX_WAKE, cnt);
 }
+static inline void __futexwait(volatile void *addr, int val, int priv)
+{
+	if (priv) priv = FUTEX_PRIVATE;
+	__syscall(SYS_futex, addr, FUTEX_WAIT|priv, val) != -ENOSYS ||
+	__syscall(SYS_futex, addr, FUTEX_WAIT, val);
+}
 
 void __acquire_ptc(void);
 void __release_ptc(void);