diff --git a/libs/gfx/source/png.cpp b/libs/gfx/source/png.cpp
index a2f39ab0..3ba843b5 100644
--- a/libs/gfx/source/png.cpp
+++ b/libs/gfx/source/png.cpp
@@ -67,7 +67,7 @@ namespace psemek::gfx
 			if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
 				png_set_expand_gray_1_2_4_to_8(png);
 
-			if (!(color_type & PNG_COLOR_MASK_ALPHA))
+			if (!(color_type & PNG_COLOR_MASK_ALPHA) && !monochrome)
 				png_set_add_alpha(png, 0xff, PNG_FILLER_AFTER);
 
 			png_read_update_info(png, info);