diff --git a/win32ss/user/user32/windows/cursoricon.c b/win32ss/user/user32/windows/cursoricon.c
index 6299c83900..3382a78b9b 100644
--- a/win32ss/user/user32/windows/cursoricon.c
+++ b/win32ss/user/user32/windows/cursoricon.c
@@ -115,22 +115,22 @@ static int get_dib_image_size( int width, int height, int depth )
 
 static BOOL is_dib_monochrome( const BITMAPINFO* info )
 {
+    BOOL found_black = FALSE, found_white = FALSE;
     if (info->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
     {
         const RGBTRIPLE *rgb = ((const BITMAPCOREINFO*)info)->bmciColors;
 
         if (((const BITMAPCOREINFO*)info)->bmciHeader.bcBitCount != 1) return FALSE;
 
-        /* Check if the first color is black */
-        if ((rgb->rgbtRed == 0) && (rgb->rgbtGreen == 0) && (rgb->rgbtBlue == 0))
-        {
-            rgb++;
+        if ((rgb[0].rgbtRed == 0) && (rgb[0].rgbtGreen == 0) && (rgb[0].rgbtBlue == 0))
+            found_black = TRUE;
+        if ((rgb[0].rgbtRed == 0xff) && (rgb[0].rgbtGreen == 0xff) && (rgb[0].rgbtBlue == 0xff))
+            found_white = TRUE;
 
-            /* Check if the second color is white */
-            return ((rgb->rgbtRed == 0xff) && (rgb->rgbtGreen == 0xff)
-                 && (rgb->rgbtBlue == 0xff));
-        }
-        else return FALSE;
+        if ((rgb[1].rgbtRed == 0) && (rgb[1].rgbtGreen == 0) && (rgb[1].rgbtBlue == 0))
+            found_black = TRUE;
+        if ((rgb[1].rgbtRed == 0xff) && (rgb[1].rgbtGreen == 0xff) && (rgb[1].rgbtBlue == 0xff))
+            found_white = TRUE;
     }
     else  /* assume BITMAPINFOHEADER */
     {
@@ -138,18 +138,17 @@ static BOOL is_dib_monochrome( const BITMAPINFO* info )
 
         if (info->bmiHeader.biBitCount != 1) return FALSE;
 
-        /* Check if the first color is black */
-        if ((rgb->rgbRed == 0) && (rgb->rgbGreen == 0) &&
-            (rgb->rgbBlue == 0) && (rgb->rgbReserved == 0))
-        {
-            rgb++;
+        if ((rgb[0].rgbRed == 0) && (rgb[0].rgbGreen == 0) && (rgb[0].rgbBlue == 0) && (rgb[0].rgbReserved == 0))
+            found_black = TRUE;
+        if ((rgb[0].rgbRed == 0xff) && (rgb[0].rgbGreen == 0xff) && (rgb[0].rgbBlue == 0xff) && (rgb[0].rgbReserved == 0))
+            found_white = TRUE;
 
-            /* Check if the second color is white */
-            return ((rgb->rgbRed == 0xff) && (rgb->rgbGreen == 0xff)
-                 && (rgb->rgbBlue == 0xff) && (rgb->rgbReserved == 0));
-        }
-        else return FALSE;
+        if ((rgb[1].rgbRed == 0) && (rgb[1].rgbGreen == 0) && (rgb[1].rgbBlue == 0) && (rgb[1].rgbReserved == 0))
+            found_black = TRUE;
+        if ((rgb[1].rgbRed == 0xff) && (rgb[1].rgbGreen == 0xff) && (rgb[1].rgbBlue == 0xff) && (rgb[1].rgbReserved == 0))
+            found_white = TRUE;
     }
+    return found_black && found_white;
 }
 
 static int bitmap_info_size( const BITMAPINFO * info, WORD coloruse )