diff --git a/internal/fusefs/syscallerr.go b/internal/fusefs/syscallerr.go
index cddbadd..2a57c91 100644
--- a/internal/fusefs/syscallerr.go
+++ b/internal/fusefs/syscallerr.go
@@ -11,58 +11,64 @@ func syscallErr(err error) syscall.Errno {
 		return 0
 	}
 
-	switch err {
-	case blefs.FSError{0x02}: // filesystem error
-		return syscall.EIO // TODO
-	case blefs.FSError{0x05}: // read-only filesystem
-		return syscall.EROFS
-	case blefs.FSError{0x03}: // no such file
-		return syscall.ENOENT
-	case blefs.FSError{0x04}: // protocol error
-		return syscall.EPROTO
-	case blefs.FSError{-5}: // input/output error
-		return syscall.EIO
-	case blefs.FSError{-84}: // filesystem is corrupted
-		return syscall.ENOTRECOVERABLE // TODO
-	case blefs.FSError{-2}: // no such directory entry
-		return syscall.ENOENT
-	case blefs.FSError{-17}: // entry already exists
-		return syscall.EEXIST
-	case blefs.FSError{-20}: // entry is not a directory
-		return syscall.ENOTDIR
-	case blefs.FSError{-39}: // directory is not empty
-		return syscall.ENOTEMPTY
-	case blefs.FSError{-9}: // bad file number
-		return syscall.EBADF
-	case blefs.FSError{-27}: // file is too large
-		return syscall.EFBIG
-	case blefs.FSError{-22}: // invalid parameter
-		return syscall.EINVAL
-	case blefs.FSError{-28}: // no space left on device
-		return syscall.ENOSPC
-	case blefs.FSError{-12}: // no more memory available
-		return syscall.ENOMEM
-	case blefs.FSError{-61}: // no attr available
-		return syscall.ENODATA // TODO
-	case blefs.FSError{-36}: // file name is too long
-		return syscall.ENAMETOOLONG
-	case blefs.ErrFileNotExists: // file does not exist
-		return syscall.ENOENT
-	case blefs.ErrFileReadOnly: // file is read only
-		return syscall.EACCES
-	case blefs.ErrFileWriteOnly: // file is write only
-		return syscall.EACCES
-	case blefs.ErrInvalidOffset: // invalid file offset
-		return syscall.EFAULT // TODO
-	case blefs.ErrOffsetChanged: // offset has already been changed
-		return syscall.ESPIPE
-	case blefs.ErrReadOpen: // only one file can be opened for reading at a time
-		return syscall.ENFILE
-	case blefs.ErrWriteOpen: // only one file can be opened for writing at a time
-		return syscall.ENFILE
-	case blefs.ErrNoRemoveRoot: // refusing to remove root directory
-		return syscall.EPERM
+	switch err := err.(type) {
+	case blefs.FSError:
+		switch err.Code {
+		case 0x02: // filesystem error
+			return syscall.EIO // TODO
+		case 0x05: // read-only filesystem
+			return syscall.EROFS
+		case 0x03: // no such file
+			return syscall.ENOENT
+		case 0x04: // protocol error
+			return syscall.EPROTO
+		case -5: // input/output error
+			return syscall.EIO
+		case -84: // filesystem is corrupted
+			return syscall.ENOTRECOVERABLE // TODO
+		case -2: // no such directory entry
+			return syscall.ENOENT
+		case -17: // entry already exists
+			return syscall.EEXIST
+		case -20: // entry is not a directory
+			return syscall.ENOTDIR
+		case -39: // directory is not empty
+			return syscall.ENOTEMPTY
+		case -9: // bad file number
+			return syscall.EBADF
+		case -27: // file is too large
+			return syscall.EFBIG
+		case -22: // invalid parameter
+			return syscall.EINVAL
+		case -28: // no space left on device
+			return syscall.ENOSPC
+		case -12: // no more memory available
+			return syscall.ENOMEM
+		case -61: // no attr available
+			return syscall.ENODATA // TODO
+		case -36: // file name is too long
+			return syscall.ENAMETOOLONG
+		}
+	default:
+		switch err {
+		case blefs.ErrFileNotExists: // file does not exist
+			return syscall.ENOENT
+		case blefs.ErrFileReadOnly: // file is read only
+			return syscall.EACCES
+		case blefs.ErrFileWriteOnly: // file is write only
+			return syscall.EACCES
+		case blefs.ErrInvalidOffset: // invalid file offset
+			return syscall.EFAULT // TODO
+		case blefs.ErrOffsetChanged: // offset has already been changed
+			return syscall.ESPIPE
+		case blefs.ErrReadOpen: // only one file can be opened for reading at a time
+			return syscall.ENFILE
+		case blefs.ErrWriteOpen: // only one file can be opened for writing at a time
+			return syscall.ENFILE
+		case blefs.ErrNoRemoveRoot: // refusing to remove root directory
+			return syscall.EPERM
+		}
 	}
 
-	return syscall.EIO // TODO
+	return syscall.EIO
 }