diff --git libxshmfence-clean/src/xshmfence_futex.h libxshmfence-workdir/src/xshmfence_futex.h
index 673ac0e..a79f535 100644
--- libxshmfence-clean/src/xshmfence_futex.h
+++ libxshmfence-workdir/src/xshmfence_futex.h
@@ -51,11 +51,27 @@ static inline int futex_wait(int32_t *addr, int32_t value) {
 #include <values.h>
 #include <linux/futex.h>
 #include <sys/time.h>
+
+#ifndef __astral__
 #include <sys/syscall.h>
+#endif
 
 static inline long sys_futex(void *addr1, int op, int val1, struct timespec *timeout, void *addr2, int val3)
 {
-	return syscall(SYS_futex, addr1, op, val1, timeout, addr2, val3);
+#ifdef __astral__
+    long ret;
+    long err;
+    register uint64_t r_timeout asm("r10") = (uint64_t)timeout;
+    asm volatile("syscall"
+        : "=a"(ret), "=d"(err)
+        : "a"(51UL), "D"(addr1), "S"((long)op), "d"((long)val1), "r"(r_timeout)
+        : "memory", "rcx", "r11");
+    if (err)
+        return -err;
+    return ret;
+#else
+    return syscall(SYS_futex, addr1, op, val1, timeout, addr2, val3);
+#endif
 }
 
 static inline int futex_wake(int32_t *addr) {