diff --git a/lib/gdi/picload.cpp b/lib/gdi/picload.cpp
index 8833ab95b5..34d02e9bc2 100644
--- a/lib/gdi/picload.cpp
+++ b/lib/gdi/picload.cpp
@@ -417,7 +417,7 @@ static void png_load(Cfilepara* filepara, int background, bool forceRGB=false)
 		filepara->transparent = (trans_alpha != NULL);
 	}
 
-	if ((bit_depth <= 8) && (color_type == PNG_COLOR_TYPE_GRAY || color_type & PNG_COLOR_MASK_PALETTE))
+	if ((bit_depth <= 8) && (color_type == PNG_COLOR_TYPE_GRAY || color_type & PNG_COLOR_MASK_PALETTE || color_type == PNG_COLOR_TYPE_RGBA))
 	{
 		if (bit_depth < 8)
 			png_set_packing(png_ptr);