2 files changed, 6 insertions, 6 deletions
diff --git a/engines/avalanche/graphics.cpp b/engines/avalanche/graphics.cpp
index aa341f383e..42a36ff83c 100644
--- a/engines/avalanche/graphics.cpp
+++ b/engines/avalanche/graphics.cpp
@@ -117,7 +117,7 @@ void Graphics::drawSprite(const SpriteInfo &sprite, byte picnum, int16 x, int16
 			}
 }
 
-Common::Point Graphics::drawArc(const ::Graphics::Surface &surface, int16 x, int16 y, int16 stAngle, int16 endAngle, uint16 radius, byte color) {
+Common::Point Graphics::drawArc(::Graphics::Surface &surface, int16 x, int16 y, int16 stAngle, int16 endAngle, uint16 radius, byte color) {
 	Common::Point endPoint;
 	const double pi = 3.14;
 	const double convfac = pi / 180.0;
@@ -205,12 +205,12 @@ Common::Point Graphics::drawArc(const ::Graphics::Surface &surface, int16 x, int
 	return endPoint;
 }
 
-void Graphics::drawPieSlice(const ::Graphics::Surface &surface, int16 x, int16 y, int16 stAngle, int16 endAngle, uint16 radius, byte color) {
+void Graphics::drawPieSlice(::Graphics::Surface &surface, int16 x, int16 y, int16 stAngle, int16 endAngle, uint16 radius, byte color) {
 	while (radius > 0)
 		drawArc(surface, x, y, stAngle, endAngle, radius--, color);
 }
 
-void Graphics::drawTriangle(const ::Graphics::Surface &surface, Common::Point *p, byte color) {
+void Graphics::drawTriangle(::Graphics::Surface &surface, Common::Point *p, byte color) {
 	// Draw the borders with a marking color.
 	_scrolls.drawLine(p[0].x, p[0].y, p[1].x, p[1].y, 255);
 	_scrolls.drawLine(p[1].x, p[1].y, p[2].x, p[2].y, 255);
diff --git a/engines/avalanche/graphics.h b/engines/avalanche/graphics.h
index 787eb6ded3..c4c1e85b02 100644
--- a/engines/avalanche/graphics.h
+++ b/engines/avalanche/graphics.h
@@ -88,14 +88,14 @@ public:
 
 	void drawSprite(const SpriteInfo &sprite, byte picnum, int16 x, int16 y);
 
-	Common::Point drawArc(const ::Graphics::Surface &surface, int16 x, int16 y, int16 stAngle, int16 endAngle, uint16 radius, byte color);
+	Common::Point drawArc(::Graphics::Surface &surface, int16 x, int16 y, int16 stAngle, int16 endAngle, uint16 radius, byte color);
 	// Taken from Free Pascal's Procedure InternalEllipseDefault. Used to replace Pascal's procedure arc.
 	// Returns the end point of the arc. (Needed in Lucerna::lucerna_clock().)
 	// TODO: Make it more accurate later.
 
-	void drawPieSlice(const ::Graphics::Surface &surface, int16 x, int16 y, int16 stAngle, int16 endAngle, uint16 radius, byte color);
+	void drawPieSlice(::Graphics::Surface &surface, int16 x, int16 y, int16 stAngle, int16 endAngle, uint16 radius, byte color);
 
-	void drawTriangle(const ::Graphics::Surface &surface, Common::Point *p, byte color);
+	void drawTriangle(::Graphics::Surface &surface, Common::Point *p, byte color);