diff --git a/src/apps/mandelbrot/Mandelbrot.cpp b/src/apps/mandelbrot/Mandelbrot.cpp
index 954cd4d431..aaa0220cde 100644
--- a/src/apps/mandelbrot/Mandelbrot.cpp
+++ b/src/apps/mandelbrot/Mandelbrot.cpp
@@ -29,7 +29,7 @@
 
 class TMainWindow : public BWindow {
 	public:
-		TMainWindow(BRect bound, char* name, window_type type,
+		TMainWindow(BRect bound, const char* name, window_type type,
 			long flags);
 		virtual ~TMainWindow();
 
@@ -44,7 +44,8 @@ class TMainWindow : public BWindow {
 };
 
 
-TMainWindow::TMainWindow(BRect bound, char* name, window_type type, long flags)
+TMainWindow::TMainWindow(BRect bound, const char* name, window_type type,
+	long flags)
 	: BWindow(bound, name, type, flags)
 {
 	BMenuBar* menuBar = new BMenuBar(BRect(0, 0, 1000, 15), "MB");
diff --git a/src/apps/mandelbrot/tsb.cpp b/src/apps/mandelbrot/tsb.cpp
index 51aa8e814d..c77b9a8f93 100644
--- a/src/apps/mandelbrot/tsb.cpp
+++ b/src/apps/mandelbrot/tsb.cpp
@@ -94,7 +94,7 @@ void	TShowBit::set_iter(long it)
 
 void	TShowBit::set_palette(long code)
 {
-	rgb_color	c;
+	rgb_color	c = {0, 0, 0, 255};
 	long		i;
 	
 	BScreen screen( Window() );
@@ -327,7 +327,7 @@ void	TShowBit::mandb(double vx, double vy, double sx, double sy)
 	long	x, y;
 	long	bx;
 	double	cx, cy;
-	char	v;
+	int		v;
 	uchar	*bits = (uchar *)the_bitmap->Bits();
 	uchar	*b0;
 	long	y12;
@@ -390,7 +390,7 @@ void	TShowBit::manda(double vx, double vy, double sx, double sy)
 	long	x, y;
 	long	bx;
 	double	cx, cy;
-	char	v;
+	int		v;
 	uchar	*bits = (uchar *)the_bitmap->Bits();
 	uchar	*b0;
 	long	y12;