diff --git a/Src/IronPython.Modules/nt.cs b/Src/IronPython.Modules/nt.cs
index a572d5c1c..b77b65a51 100644
--- a/Src/IronPython.Modules/nt.cs
+++ b/Src/IronPython.Modules/nt.cs
@@ -774,23 +774,6 @@ public override string __repr__(CodeContext context) {
             }
         }
 
-        [PythonHidden(PlatformsAttribute.PlatformFamily.Windows)]
-        public static uname_result uname() {
-            Mono.Unix.Native.Utsname info;
-            Mono.Unix.Native.Syscall.uname(out info);
-            return new uname_result(info.sysname, info.nodename, info.release, info.version, info.machine);
-        }
-
-        [PythonHidden(PlatformsAttribute.PlatformFamily.Windows)]
-        public static BigInteger getuid() {
-            return Mono.Unix.Native.Syscall.getuid();
-        }
-
-        [PythonHidden(PlatformsAttribute.PlatformFamily.Windows)]
-        public static BigInteger geteuid() {
-            return Mono.Unix.Native.Syscall.geteuid();
-        }
-
 #endif
 
 #if FEATURE_FILESYSTEM
@@ -1286,12 +1269,15 @@ public sealed class stat_result : PythonTuple {
 
             internal stat_result(int mode) : this(new object[10] { mode, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, null) { }
 
+            [SupportedOSPlatform("linux")]
+            [SupportedOSPlatform("macos")]
             internal stat_result(Mono.Unix.Native.Stat stat)
                 : this(new object[16] {Mono.Unix.Native.NativeConvert.FromFilePermissions(stat.st_mode), ToInt(stat.st_ino), ToInt(stat.st_dev), ToInt(stat.st_nlink), ToInt(stat.st_uid), ToInt(stat.st_gid), ToInt(stat.st_size),
                       ToInt(stat.st_atime), ToInt(stat.st_mtime), ToInt(stat.st_ctime),
                       stat.st_atime + stat.st_atime_nsec / (double)nanosecondsPerSeconds, stat.st_mtime + stat.st_mtime_nsec / (double)nanosecondsPerSeconds, stat.st_ctime + stat.st_ctime_nsec / (double)nanosecondsPerSeconds,
                       ToInt(stat.st_atime * nanosecondsPerSeconds + stat.st_atime_nsec), ToInt(stat.st_mtime * nanosecondsPerSeconds + stat.st_mtime_nsec), ToInt(stat.st_ctime * nanosecondsPerSeconds + stat.st_ctime_nsec) }, null) { }
 
+            [SupportedOSPlatform("windows")]
             internal stat_result(int mode, ulong fileidx, long size, long st_atime_ns, long st_mtime_ns, long st_ctime_ns)
                 : this(new object[16] { mode, ToInt(fileidx), 0, 0, 0, 0, ToInt(size),
                       ToInt(st_atime_ns / nanosecondsPerSeconds), ToInt(st_mtime_ns / nanosecondsPerSeconds), ToInt(st_ctime_ns / nanosecondsPerSeconds),
diff --git a/Src/IronPython.Modules/posix.cs b/Src/IronPython.Modules/posix.cs
index f7ced2e67..6c8412126 100644
--- a/Src/IronPython.Modules/posix.cs
+++ b/Src/IronPython.Modules/posix.cs
@@ -6,6 +6,7 @@
 
 using System;
 using System.IO;
+using System.Numerics;
 using System.Runtime.InteropServices;
 using System.Runtime.Versioning;
 using System.Text;
@@ -178,6 +179,31 @@ internal static void ftruncateUnix(int fd, long length) {
         }
 
 
+        [PythonHidden(PlatformsAttribute.PlatformFamily.Windows)]
+        [SupportedOSPlatform("linux")]
+        [SupportedOSPlatform("macos")]
+        public static uname_result uname() {
+            if (Syscall.uname(out Utsname info) == 0) {
+                return new uname_result(info.sysname, info.nodename, info.release, info.version, info.machine);
+            }
+            throw GetLastUnixError();  // rare
+        }
+
+        [PythonHidden(PlatformsAttribute.PlatformFamily.Windows)]
+        [SupportedOSPlatform("linux")]
+        [SupportedOSPlatform("macos")]
+        public static BigInteger getuid() {
+            return Syscall.getuid();
+        }
+
+        [PythonHidden(PlatformsAttribute.PlatformFamily.Windows)]
+        [SupportedOSPlatform("linux")]
+        [SupportedOSPlatform("macos")]
+        public static BigInteger geteuid() {
+            return Syscall.geteuid();
+        }
+
+
         [SupportedOSPlatform("linux")]
         [SupportedOSPlatform("macos")]
         private static void utimeUnix(string path, long atime_ns, long utime_ns) {