diff --git a/lib/std/child_process.zig b/lib/std/child_process.zig
index e1c489bf059901841f14fd76a766046fc3a36d95..1bd0becfd057c1da21e648afd05557d7f13976c0 100644
--- a/lib/std/child_process.zig
+++ b/lib/std/child_process.zig
@@ -357,6 +357,7 @@ pub const ChildProcess = struct {
                 error.NoSpaceLeft => unreachable,
                 error.FileTooBig => unreachable,
                 error.DeviceBusy => unreachable,
+                error.FileLocksNotSupported => unreachable,
                 else => |e| return e,
             }
         else
diff --git a/lib/std/fs.zig b/lib/std/fs.zig
index ccfe54c5c462c3912bbc97806d4f6dbcbf4ae7d4..f64bd61569d644dda373ce91a2a6c82f88a4dc59 100644
--- a/lib/std/fs.zig
+++ b/lib/std/fs.zig
@@ -843,6 +843,7 @@ pub const Dir = struct {
             error.IsDir => unreachable, // we're providing O_DIRECTORY
             error.NoSpaceLeft => unreachable, // not providing O_CREAT
             error.PathAlreadyExists => unreachable, // not providing O_CREAT
+            error.FileLocksNotSupported => unreachable, // locking folders is not supported
             else => |e| return e,
         };
         return Dir{ .fd = fd };
diff --git a/lib/std/os.zig b/lib/std/os.zig
index aa302490d0eb6f455d45b6458149444226be31e6..e0e998a4a6a8183e05fd5e2e2ca20344afe13b08 100644
--- a/lib/std/os.zig
+++ b/lib/std/os.zig
@@ -819,26 +819,34 @@ pub const OpenError = error{
     SystemFdQuotaExceeded,
     NoDevice,
     FileNotFound,
+
     /// The path exceeded `MAX_PATH_BYTES` bytes.
     NameTooLong,
+
     /// Insufficient kernel memory was available, or
     /// the named file is a FIFO and per-user hard limit on
     /// memory allocation for pipes has been reached.
     SystemResources,
+
     /// The file is too large to be opened. This error is unreachable
     /// for 64-bit targets, as well as when opening directories.
     FileTooBig,
+
     /// The path refers to directory but the `O_DIRECTORY` flag was not provided.
     IsDir,
+
     /// A new path cannot be created because the device has no room for the new file.
     /// This error is only reachable when the `O_CREAT` flag is provided.
     NoSpaceLeft,
+
     /// A component used as a directory in the path was not, in fact, a directory, or
     /// `O_DIRECTORY` was specified and the path was not a directory.
     NotDir,
+
     /// The path already exists and the `O_CREAT` and `O_EXCL` flags were provided.
     PathAlreadyExists,
     DeviceBusy,
+
     /// The underlying filesystem does not support file locks
     FileLocksNotSupported,
 } || UnexpectedError;
diff --git a/lib/std/zig/system.zig b/lib/std/zig/system.zig
index 2ce7b406a4153158c32255eaa4ff4430e59201d8..f6a45860be37a615fd6d8f00326de08164c885df 100644
--- a/lib/std/zig/system.zig
+++ b/lib/std/zig/system.zig
@@ -468,9 +468,8 @@ pub const NativeTargetInfo = struct {
             error.InvalidUtf8 => unreachable,
             error.BadPathName => unreachable,
             error.PipeBusy => unreachable,
-            error.PermissionDenied => unreachable,
-            error.FileBusy => unreachable,
-            error.Locked => unreachable,
+            error.FileLocksNotSupported => unreachable,
+            error.WouldBlock => unreachable,
 
             error.IsDir,
             error.NotDir,
diff --git a/src-self-hosted/stage2.zig b/src-self-hosted/stage2.zig
index 802493b7c017b036761bf768a6e20f41674b1fb5..2ea414106cc1165376942f8439fb1eca80ebaf02 100644
--- a/src-self-hosted/stage2.zig
+++ b/src-self-hosted/stage2.zig
@@ -115,7 +115,6 @@ const Error = extern enum {
     InvalidOperatingSystemVersion,
     UnknownClangOption,
     NestedResponseFile,
-    PermissionDenied,
     FileBusy,
     Locked,
 };
@@ -849,9 +848,7 @@ export fn stage2_libc_parse(stage1_libc: *Stage2LibCInstallation, libc_file_z: [
         error.NoDevice => return .NoDevice,
         error.NotDir => return .NotDir,
         error.DeviceBusy => return .DeviceBusy,
-        error.PermissionDenied => return .PermissionDenied,
-        error.FileBusy => return .FileBusy,
-        error.Locked => return .Locked,
+        error.FileLocksNotSupported => unreachable,
     };
     stage1_libc.initFromStage2(libc);
     return .None;
diff --git a/src/error.cpp b/src/error.cpp
index 1ad9589a14e6b77085c1bda10bda0b8f87a8b89c..03597686b8c0b8d9b39ab8962054dbe221303335 100644
--- a/src/error.cpp
+++ b/src/error.cpp
@@ -85,7 +85,6 @@ const char *err_str(Error err) {
         case ErrorInvalidOperatingSystemVersion: return "invalid operating system version";
         case ErrorUnknownClangOption: return "unknown Clang option";
         case ErrorNestedResponseFile: return "nested response file";
-        case ErrorPermissionDenied: return "permission is denied";
         case ErrorFileBusy: return "file is busy";
         case ErrorLocked: return "file is locked by another process";
     }
diff --git a/src/stage2.h b/src/stage2.h
index 76b6683ba3ad05b9e0108ea99fc40cc43ac2d156..0e5b28b0e86bbc0708d86c1161f95ee58f6b92c9 100644
--- a/src/stage2.h
+++ b/src/stage2.h
@@ -107,7 +107,6 @@ enum Error {
     ErrorInvalidOperatingSystemVersion,
     ErrorUnknownClangOption,
     ErrorNestedResponseFile,
-    ErrorPermissionDenied,
     ErrorFileBusy,
     ErrorLocked,
 };