diff --git a/amiga/bitmap.c b/amiga/bitmap.c
index a6c24b1af..e28b21463 100644
--- a/amiga/bitmap.c
+++ b/amiga/bitmap.c
@@ -495,7 +495,7 @@ static PLANEPTR ami_bitmap_get_mask(struct bitmap *bitmap, int width, int height
 
 	for(y=0; y<height; y++) {
 		for(x=0; x<width; x++) {
-			if ((*bmi & 0x000000ffU) == 0x00000000U) maskbit = 0;
+			if ((*bmi & 0x000000ffU) <= (ULONG)nsoption_int(mask_alpha)) maskbit = 0;
 				else maskbit = 1;
 			bmi++;
 			bitmap->native_mask[(y*(width/8)) + (x/8)] =
diff --git a/amiga/options.h b/amiga/options.h
index 41bf104f5..ed5bc93eb 100644
--- a/amiga/options.h
+++ b/amiga/options.h
@@ -50,6 +50,7 @@
 	bool faster_scroll;			\
 	bool scale_quality;			\
 	int dither_quality;			\
+	int mask_alpha;				\
 	bool ask_overwrite;			\
 	int printer_unit;			\
 	int print_scale;			\
@@ -111,6 +112,7 @@
 	.faster_scroll = true,				\
 	.scale_quality = false,				\
 	.dither_quality = 1,				\
+	.mask_alpha = 0,					\
 	.ask_overwrite = true,				\
 	.printer_unit = 0,				\
 	.print_scale = 100,				\
@@ -171,6 +173,7 @@
 { "faster_scroll",	OPTION_BOOL,	&nsoptions.faster_scroll}, \
 { "scale_quality",	OPTION_BOOL,	&nsoptions.scale_quality}, \
 { "dither_quality",	OPTION_INTEGER,	&nsoptions.dither_quality}, \
+{ "mask_alpha",		OPTION_INTEGER,	&nsoptions.mask_alpha},	\
 { "ask_overwrite",	OPTION_BOOL,	&nsoptions.ask_overwrite}, \
 { "printer_unit",	OPTION_INTEGER,	&nsoptions.printer_unit}, \
 { "print_scale",	OPTION_INTEGER,	&nsoptions.print_scale}, \