diff --git a/libc/include/sys/uio.h b/libc/include/sys/uio.h
index d3e6561..eff3b14 100644
--- a/libc/include/sys/uio.h
+++ b/libc/include/sys/uio.h
@@ -69,6 +69,8 @@
  *
  * Available since API level 24.
  */
+
+#if __BIONIC_AVAILABILITY_GUARD(24)
 ssize_t preadv(int __fd, const struct iovec* _Nonnull __iov, int __count, off_t __offset) __RENAME_IF_FILE_OFFSET64(preadv64) __INTRODUCED_IN(24);
 
 /**
@@ -96,6 +98,8 @@
  * Available since API level 24.
  */
 ssize_t pwritev64(int __fd, const struct iovec* _Nonnull __iov, int __count, off64_t __offset) __INTRODUCED_IN(24);
+#endif /* __BIONIC_AVAILABILITY_GUARD(24) */
+
 
 /**
  * [preadv2(2)](https://man7.org/linux/man-pages/man2/preadv2.2.html) reads
@@ -107,6 +111,8 @@
  *
  * Available since API level 33.
  */
+
+#if __BIONIC_AVAILABILITY_GUARD(33)
 ssize_t preadv2(int __fd, const struct iovec* _Nonnull __iov, int __count, off_t __offset, int __flags) __RENAME_IF_FILE_OFFSET64(preadv64v2) __INTRODUCED_IN(33);
 
 /**
@@ -134,6 +140,8 @@
  * Available since API level 33.
  */
 ssize_t pwritev64v2(int __fd, const struct iovec* _Nonnull __iov, int __count, off64_t __offset, int __flags) __INTRODUCED_IN(33);
+#endif /* __BIONIC_AVAILABILITY_GUARD(33) */
+
 
 /**
  * [process_vm_readv(2)](https://man7.org/linux/man-pages/man2/process_vm_readv.2.html)
@@ -144,6 +152,8 @@
  *
  * Available since API level 23.
  */
+
+#if __BIONIC_AVAILABILITY_GUARD(23)
 ssize_t process_vm_readv(pid_t __pid, const struct iovec* __BIONIC_COMPLICATED_NULLNESS __local_iov, unsigned long __local_iov_count, const struct iovec* __BIONIC_COMPLICATED_NULLNESS __remote_iov, unsigned long __remote_iov_count, unsigned long __flags) __INTRODUCED_IN(23);
 
 /**
@@ -156,6 +166,8 @@
  * Available since API level 23.
  */
 ssize_t process_vm_writev(pid_t __pid, const struct iovec* __BIONIC_COMPLICATED_NULLNESS __local_iov, unsigned long __local_iov_count, const struct iovec* __BIONIC_COMPLICATED_NULLNESS __remote_iov, unsigned long __remote_iov_count, unsigned long __flags) __INTRODUCED_IN(23);
+#endif /* __BIONIC_AVAILABILITY_GUARD(23) */
+
 
 #endif