diff --git a/engines/ultima/nuvie/gui/gui_callback.h b/engines/ultima/nuvie/gui/gui_callback.h
index 641cd7c55b3..eecb3786ae1 100644
--- a/engines/ultima/nuvie/gui/gui_callback.h
+++ b/engines/ultima/nuvie/gui/gui_callback.h
@@ -39,7 +39,7 @@ public:
 		return;
 	}
 	virtual GUI_status callback(uint16 msg, GUI_CallBack *caller, void *data) {
-		DEBUG(0, LEVEL_WARNING, "Unhandled callback. msg (%x)\n", msg);
+		DEBUG(false, LEVEL_WARNING, "Unhandled callback. msg (%x)\n", msg);
 		return GUI_PASS;
 	}
 
diff --git a/engines/ultima/nuvie/gui/gui_drag_manager.cpp b/engines/ultima/nuvie/gui/gui_drag_manager.cpp
index b03fd414c0c..de6191902ea 100644
--- a/engines/ultima/nuvie/gui/gui_drag_manager.cpp
+++ b/engines/ultima/nuvie/gui/gui_drag_manager.cpp
@@ -34,7 +34,7 @@ GUI_DragManager::GUI_DragManager(Screen *s): screen(s), message(0),
 }
 
 GUI_status GUI_DragManager::start_drag(GUI_DragArea *src, int msg, void *d, unsigned char *icon_buf, uint16 w, uint16 h, uint8 bpp, bool out_of_range) {
-	DEBUG(0, LEVEL_DEBUGGING, "Start Drag\n");
+	DEBUG(false, LEVEL_DEBUGGING, "Start Drag\n");
 
 	drag_source = src;
 	message = msg;
diff --git a/engines/ultima/nuvie/gui/gui_text_toggle_button.cpp b/engines/ultima/nuvie/gui/gui_text_toggle_button.cpp
index 04674f9308a..738e9c166a0 100644
--- a/engines/ultima/nuvie/gui/gui_text_toggle_button.cpp
+++ b/engines/ultima/nuvie/gui/gui_text_toggle_button.cpp
@@ -29,7 +29,7 @@ GUI_TextToggleButton::GUI_TextToggleButton(void *data, int x, int y, int w, int
 		const char *const *texts_, int count_, int selection_,
 		GUI_Font *font, ButtonTextAlign alignment_,
 		GUI_CallBack *callback, int flat)
-	: GUI_Button(data, x, y, w, h, "", font, alignment_, 0, callback, flat), count(count_),
+	: GUI_Button(data, x, y, w, h, "", font, alignment_, false, callback, flat), count(count_),
 	  selection(selection_), alignment(alignment_) {
 	assert(count > 0);
 	assert(selection >= 0 && selection < count);
diff --git a/engines/ultima/nuvie/gui/gui_yes_no_dialog.cpp b/engines/ultima/nuvie/gui/gui_yes_no_dialog.cpp
index 1f11e624037..1d8028cbf21 100644
--- a/engines/ultima/nuvie/gui/gui_yes_no_dialog.cpp
+++ b/engines/ultima/nuvie/gui/gui_yes_no_dialog.cpp
@@ -39,11 +39,11 @@ GUI_YesNoDialog::GUI_YesNoDialog(GUI *gui, int x, int y, int w, int h, const cha
 	  yes_callback_object(yesCallback), no_callback_object(noCallback) {
 	GUI_Widget *widget;
 
-	yes_button = new GUI_Button(this, 100, 50, 40, 18, "Yes", gui->get_font(), BUTTON_TEXTALIGN_CENTER, 0, this, 0);
+	yes_button = new GUI_Button(this, 100, 50, 40, 18, "Yes", gui->get_font(), BUTTON_TEXTALIGN_CENTER, false, this, false);
 	AddWidget(yes_button);
 	button_index[0] = yes_button;
 
-	no_button = new GUI_Button(this, 30, 50, 40, 18, "No", gui->get_font(), BUTTON_TEXTALIGN_CENTER, 0, this, 0);
+	no_button = new GUI_Button(this, 30, 50, 40, 18, "No", gui->get_font(), BUTTON_TEXTALIGN_CENTER, false, this, false);
 	AddWidget(no_button);
 	button_index[1] = no_button;
 
diff --git a/engines/ultima/nuvie/sound/adplug/u6m.h b/engines/ultima/nuvie/sound/adplug/u6m.h
index 9a3be0ff851..e789c08eecb 100644
--- a/engines/ultima/nuvie/sound/adplug/u6m.h
+++ b/engines/ultima/nuvie/sound/adplug/u6m.h
@@ -32,8 +32,8 @@ class Cu6mPlayer: public CPlayer {
 public:
 	static CPlayer *factory(Copl *newopl);
 
-	Cu6mPlayer(Copl *newopl) : CPlayer(newopl), song_data(0), driver_active(0),
-		songend(0), song_pos(0), loop_position(0), read_delay(0), played_ticks(0) {
+	Cu6mPlayer(Copl *newopl) : CPlayer(newopl), song_data(0), driver_active(false),
+		songend(false), song_pos(0), loop_position(0), read_delay(0), played_ticks(0) {
 		ARRAYCLEAR(channel_freq);
 	}