diff --git a/lib/std/os/linux.zig b/lib/std/os/linux.zig
index d7d29e0df1a6863f8013de9e0be52290fab0a0fc..3319f08fc77350f3a20b8e1b7ff2e2ce4f2da4b5 100644
--- a/lib/std/os/linux.zig
+++ b/lib/std/os/linux.zig
@@ -1834,8 +1834,8 @@ pub fn setgroups(size: usize, list: [*]const gid_t) usize {
     }
 }
 
-pub fn setsid() pid_t {
-    return @bitCast(@as(u32, @truncate(syscall0(.setsid))));
+pub fn setsid() usize {
+    return syscall0(.setsid);
 }
 
 pub fn getpid() pid_t {
diff --git a/lib/std/posix.zig b/lib/std/posix.zig
index e0fd68db2446b8031ac472bc877e411a06aed7f1..77a61b4bf4a0cec666df0190f15d3d681d1d676a 100644
--- a/lib/std/posix.zig
+++ b/lib/std/posix.zig
@@ -7000,7 +7000,7 @@ pub const SetSidError = error{
 pub fn setsid() SetSidError!pid_t {
     const rc = system.setsid();
     switch (errno(rc)) {
-        .SUCCESS => return rc,
+        .SUCCESS => return @intCast(rc),
         .PERM => return error.PermissionDenied,
         else => |err| return unexpectedErrno(err),
     }