diff --git a/reactos/base/applications/cmdutils/fsutil/dirty.c b/reactos/base/applications/cmdutils/fsutil/dirty.c
index e20d4317b06..bd5be20a2d1 100644
--- a/reactos/base/applications/cmdutils/fsutil/dirty.c
+++ b/reactos/base/applications/cmdutils/fsutil/dirty.c
@@ -60,15 +60,50 @@ QueryMain(int argc, const TCHAR *argv[])
     /* Print the status */
     _ftprintf(stdout, _T("The %s volume is %s\n"), argv[1], (VolumeStatus & VOLUME_IS_DIRTY ? _T("dirty") : _T("clean")));
 
-    return 1;
+    return 0;
 }
 
 static int
 SetMain(int argc, const TCHAR *argv[])
 {
-    /* FIXME */
-    _ftprintf(stderr, _T("Not implemented\n"));
-    return 1;
+    HANDLE Volume;
+    DWORD BytesRead;
+    TCHAR VolumeID[PATH_MAX];
+
+    /* We need a volume (letter or GUID) */
+    if (argc < 2)
+    {
+        _ftprintf(stderr, _T("Usage: fsutil dirty set <volume>\n"));
+        _ftprintf(stderr, _T("\tFor example: fsutil dirty set c:\n"));
+        return 1;
+    }
+
+    /* Create full name */
+    _stprintf(VolumeID, _T("\\\\.\\%s"), argv[1]);
+
+    /* Open the volume */
+    Volume = CreateFile(VolumeID, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
+                        NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+    if (Volume == INVALID_HANDLE_VALUE)
+    {
+        _ftprintf(stderr, _T("Error: %d\n"), GetLastError());
+        return 1;
+    }
+
+    /* And set the dirty bit */
+    if (DeviceIoControl(Volume, FSCTL_MARK_VOLUME_DIRTY, NULL, 0, NULL, 0, &BytesRead, NULL) == FALSE)
+    {
+        _ftprintf(stderr, _T("Error: %d\n"), GetLastError());
+        CloseHandle(Volume);
+        return 1;
+    }
+
+    CloseHandle(Volume);
+
+    /* Print the status */
+    _ftprintf(stdout, _T("The %s volume is now marked as dirty\n"), argv[1]);
+
+    return 0;
 }
 
 static void