diff --git display/simgraph16.cc display/simgraph16.cc
index 97e2be4bc..f0db9e882 100644
--- display/simgraph16.cc
+++ display/simgraph16.cc
@@ -104,8 +104,8 @@ public:
 		if(  steps == 0  ) {
 			return;
 		}
-		sdx = (dx << 16) / steps;
-		sdy = (dy << 16) / steps;
+		sdx = (dx * (1 << 16)) / steps;
+		sdy = (dy * (1 << 16)) / steps;
 		// to stay right from the line
 		// left border: xmin <= x
 		// right border: x < xmax
@@ -114,7 +114,7 @@ public:
 				inc = 1 << 16;
 			}
 			else {
-				inc = (dx << 16) / dy -  (1 << 16);
+				inc = (dx * (1 << 16)) / dy -  (1 << 16);
 			}
 		}
 		else if(  dy < 0  ) {
@@ -144,11 +144,11 @@ public:
 		}
 		if(  dy != 0  ) {
 			// init Bresenham algorithm
-			const int t = ((y - y0) << 16) / sdy;
+			const int t = ((y - y0) * (1<< 16)) / sdy;
 			// sx >> 16 = x
 			// sy >> 16 = y
-			r.sx = t * sdx + inc + (x0 << 16);
-			r.sy = t * sdy + (y0 << 16);
+			r.sx = t * sdx + inc + (x0 * (1 << 16));
+			r.sy = t * sdy + (y0 * (1 << 16));
 		}
 	}
 
@@ -4705,11 +4705,11 @@ void display_direct_line_rgb(const KOORD_VAL x, const KOORD_VAL y, const KOORD_V
 		steps = 1;
 	}
 
-	xs = (dx << 16) / steps;
-	ys = (dy << 16) / steps;
+	xs = (dx * (1 << 16)) / steps;
+	ys = (dy * (1 << 16)) / steps;
 
-	xp = x << 16;
-	yp = y << 16;
+	xp = x  * (1 << 16);
+	yp = y  * (1 << 16);
 
 	for (i = 0; i <= steps; i++) {
 #ifdef DEBUG_FLUSH_BUFFER
@@ -4740,11 +4740,11 @@ void display_direct_line_dotted_rgb(const KOORD_VAL x, const KOORD_VAL y, const
 		steps = 1;
 	}
 
-	xs = (dx << 16) / steps;
-	ys = (dy << 16) / steps;
+	xs = (dx  * (1 << 16)) / steps;
+	ys = (dy  * (1 << 16)) / steps;
 
-	xp = x << 16;
-	yp = y << 16;
+	xp = x * (1 << 16);
+	yp = y * (1 << 16);
 
 	for(  i = 0;  i <= steps;  i++  ) {
 		counter ++;