diff --git a/dlls/gdi32/dibdrv/primitives.c b/dlls/gdi32/dibdrv/primitives.c
index e740ef87cd8..a99fcabc61e 100644
--- a/dlls/gdi32/dibdrv/primitives.c
+++ b/dlls/gdi32/dibdrv/primitives.c
@@ -2141,12 +2141,16 @@ static DWORD rgb_to_pixel_mono(const dib_info *dib, BOOL dither, int x, int y,
 {
     DWORD ret;
 
-    if (dither)
-        ret = ((30 * r + 59 * g + 11 * b) / 100 + bayer_16x16[y % 16][x % 16]) > 255;
-    else if (dib->color_table_size == 1)
-        ret = (src_pixel == bg_pixel);
-    else
+    if (dib->color_table_size != 1)
+    {
+        if (dither)
+        {
+            if (((30 * r + 59 * g + 11 * b) / 100 + bayer_16x16[y % 16][x % 16]) > 255) r = g = b = 255;
+            else r = g = b = 0;
+        }
         ret = rgb_to_pixel_colortable( dib, r, g, b );
+    }
+    else ret = (src_pixel == bg_pixel);  /* only match raw pixel value */
 
     return ret ? 0xff : 0;
 }
diff --git a/dlls/gdi32/tests/dib.c b/dlls/gdi32/tests/dib.c
index 188001e5606..4bf64aa643b 100644
--- a/dlls/gdi32/tests/dib.c
+++ b/dlls/gdi32/tests/dib.c
@@ -1880,7 +1880,7 @@ static void draw_graphics(HDC hdc, const BITMAPINFO *bmi, BYTE *bits)
     if (bmi->bmiHeader.biBitCount == 8 && bmi->bmiHeader.biClrUsed == 256)  /* 8-bpp grayscale broken on NT4 */
         compare_hash_broken_todo(hdc, bmi, bits, "bottom-up 8888 dib brush patblt", 1, FALSE);
     else
-        compare_hash_broken_todo(hdc, bmi, bits, "bottom-up 8888 dib brush patblt", dib_is_1bpp ? 2 : 0, dib_is_1bpp);
+        compare_hash_broken_todo(hdc, bmi, bits, "bottom-up 8888 dib brush patblt", dib_is_1bpp ? 2 : 0, FALSE);
 
     SelectObject(hdc, orig_brush);
     DeleteObject(dib_brush);
@@ -1910,7 +1910,7 @@ static void draw_graphics(HDC hdc, const BITMAPINFO *bmi, BYTE *bits)
     if (bmi->bmiHeader.biBitCount == 8 && bmi->bmiHeader.biClrUsed == 256)  /* 8-bpp grayscale broken on NT4 */
         compare_hash_broken_todo(hdc, bmi, bits, "top-down 24 bpp brush patblt", 1, FALSE);
     else
-        compare_hash_broken_todo(hdc, bmi, bits, "top-down 24 bpp brush patblt", dib_is_1bpp ? 2 : 0, dib_is_1bpp);
+        compare_hash_broken_todo(hdc, bmi, bits, "top-down 24 bpp brush patblt", dib_is_1bpp ? 2 : 0, FALSE);
 
     SelectObject(hdc, orig_brush);
     DeleteObject(dib_brush);