diff --git a/amiga/gui_options.c b/amiga/gui_options.c
index d3f713060..b969eb8c8 100755
--- a/amiga/gui_options.c
+++ b/amiga/gui_options.c
@@ -406,6 +406,7 @@ void ami_gui_opts_open(void)
 	BOOL proxyhostdisabled = TRUE, proxyauthdisabled = TRUE, proxybypassdisabled = FALSE;
 	BOOL disableanims, animspeeddisabled = FALSE, acceptlangdisabled = FALSE;
 	BOOL scaleselected = nsoption_bool(scale_quality), scaledisabled = FALSE;
+	BOOL ditherdisable = TRUE;
 	BOOL download_notify_disabled = FALSE;
 	BOOL ptr_disable = FALSE;
 	char animspeed[10];
@@ -446,6 +447,9 @@ void ami_gui_opts_open(void)
 		screenmodeid = strtoul(nsoption_charp(screen_modeid),NULL,0);
 	}
 
+	if(ami_plot_screen_is_palettemapped() == true)
+		ditherdisable = FALSE;
+
 	if(nsoption_bool(http_proxy) == true)
 	{
 		proxytype = nsoption_int(http_proxy_auth) + 1;
@@ -907,6 +911,7 @@ void ami_gui_opts_open(void)
 									LAYOUT_AddChild, gow->objects[GID_OPTS_DITHERQ] = ChooserObject,
 										GA_ID, GID_OPTS_DITHERQ,
 										GA_RelVerify, TRUE,
+										GA_Disabled, ditherdisable,
 										CHOOSER_PopUp, TRUE,
 										CHOOSER_LabelArray, ditheropts,
 										CHOOSER_Selected, nsoption_int(dither_quality),
diff --git a/resources/FatMessages b/resources/FatMessages
index ff5a761d8..74f03e456 100644
--- a/resources/FatMessages
+++ b/resources/FatMessages
@@ -5681,11 +5681,11 @@ de.all.ScaleQuality:Skalieren hoher Qualität
 fr.all.ScaleQuality:Higher quality scaling
 it.all.ScaleQuality:Massima qualità di visualizzazione
 nl.all.ScaleQuality:Higher quality scaling
-en.ami.DitherQuality:Dither quality (<= 8-bit modes only)
-de.ami.DitherQuality:Dither quality (<= 8-bit modes only)
-fr.ami.DitherQuality:Dither quality (<= 8-bit modes only)
-it.ami.DitherQuality:Qualità dither (<= solo modi a 8-bit)
-nl.ami.DitherQuality:Dither quality (<= 8-bit modes only)
+en.ami.DitherQuality:Dither quality
+de.ami.DitherQuality:Dither quality
+fr.ami.DitherQuality:Dither quality
+it.ami.DitherQuality:Qualità dither
+nl.ami.DitherQuality:Dither quality
 en.ami.Low:Low
 de.ami.Low:Low
 fr.ami.Low:Low