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diff --git a/lib/std/os.zig b/lib/std/os.zig
index 988ab873d..58f74563e 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -2997,7 +2997,7 @@ pub fn sendto(
while (true) {
const rc = system.sendto(sockfd, buf.ptr, buf.len, flags, dest_addr, addrlen);
switch (errno(rc)) {
- 0 => return rc,
+ 0 => return @intCast(usize, rc),
EACCES => return error.AccessDenied,
EAGAIN => if (std.event.Loop.instance) |loop| {
@@ -3063,7 +3063,7 @@ pub fn poll(fds: []pollfd, timeout: i32) PollError!usize {
while (true) {
const rc = system.poll(fds.ptr, fds.len, timeout);
switch (errno(rc)) {
- 0 => return rc,
+ 0 => return @intCast(usize, rc),
EFAULT => unreachable,
EINTR => continue,
EINVAL => unreachable,
@@ -3096,7 +3096,7 @@ pub fn recvfrom(
while (true) {
const rc = system.recvfrom(sockfd, buf.ptr, buf.len, flags, src_addr, addrlen);
switch (errno(rc)) {
- 0 => return rc,
+ 0 => return @intCast(usize, rc),
EBADF => unreachable, // always a race condition
EFAULT => unreachable,
EINVAL => unreachable,
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