diff --git a/source/blender/editors/interface/interface_regions.c b/source/blender/editors/interface/interface_regions.c
index 79029316453..c1bfa2dc799 100644
--- a/source/blender/editors/interface/interface_regions.c
+++ b/source/blender/editors/interface/interface_regions.c
@@ -2175,7 +2175,7 @@ static void uiBlockPicker(uiBlock *block, float rgba[4], PointerRNA *ptr, Proper
 	uiBlockEndAlign(block);
 
 	if (rgba[3] != FLT_MAX) {
-		bt = uiDefButR_prop(block, NUMSLI, 0, IFACE_("A "),  0, yco -= UI_UNIT_Y, butwidth, UI_UNIT_Y, ptr, prop, 3, 0.0, 0.0, 0, 0, TIP_("Alpha"));
+		bt = uiDefButR_prop(block, NUMSLI, 0, IFACE_("A "),  0, yco -= UI_UNIT_Y, butwidth, UI_UNIT_Y, ptr, prop, 3, 0.0, 0.0, 0, 3, TIP_("Alpha"));
 		uiButSetFunc(bt, do_picker_rna_cb, bt, NULL);
 	}
 	else {