diff --git a/lib/impact/collision-map.js b/lib/impact/collision-map.js
index 23f5dde..c05440c 100644
--- a/lib/impact/collision-map.js
+++ b/lib/impact/collision-map.js
@@ -41,7 +41,7 @@ ig.CollisionMap = ig.Map.extend({
 			var sy = vy / steps;
 			
 			for( var i = 0; i < steps && (sx || sy); i++ ) {
-				this._traceStep( res, x, y, sx, sy, objectWidth, objectHeight, vx, vy, i );
+				this._traceStep( res, x, y, sx, sy, objectWidth, objectHeight, i );
 				
 				x = res.pos.x;
 				y = res.pos.y;
@@ -53,14 +53,14 @@ ig.CollisionMap = ig.Map.extend({
 		
 		// Just one step
 		else {
-			this._traceStep( res, x, y, vx, vy, objectWidth, objectHeight, vx, vy, 0 );
+			this._traceStep( res, x, y, vx, vy, objectWidth, objectHeight, 0 );
 		}
 		
 		return res;
 	},
 	
 	
-	_traceStep: function( res, x, y, vx, vy, width, height, rvx, rvy, step ) {
+	_traceStep: function( res, x, y, vx, vy, width, height, step ) {
 		
 		res.pos.x += vx;
 		res.pos.y += vy;
@@ -92,7 +92,7 @@ ig.CollisionMap = ig.Map.extend({
 						t = this.data[tileY][prevTileX];
 						if(	
 							t > 1 && t <= this.lastSlope && 
-							this._checkTileDef(res, t, x, y, rvx, rvy, width, height, prevTileX, tileY) 
+							this._checkTileDef(res, t, x, y, vx, vy, width, height, prevTileX, tileY) 
 						) {
 							break;
 						}
@@ -101,7 +101,7 @@ ig.CollisionMap = ig.Map.extend({
 					t = this.data[tileY][tileX];
 					if(
 						t == 1 || t > this.lastSlope || // fully solid tile?
-						(t > 1 && this._checkTileDef(res, t, x, y, rvx, rvy, width, height, tileX, tileY)) // slope?
+						(t > 1 && this._checkTileDef(res, t, x, y, vx, vy, width, height, tileX, tileY)) // slope?
 					) {
 						if( t > 1 && t <= this.lastSlope && res.collision.slope ) {
 							break;
@@ -139,7 +139,7 @@ ig.CollisionMap = ig.Map.extend({
 						t = this.data[prevTileY][tileX];
 						if( 
 							t > 1 && t <= this.lastSlope &&
-							this._checkTileDef(res, t, x, y, rvx, rvy, width, height, tileX, prevTileY) ) {
+							this._checkTileDef(res, t, x, y, vx, vy, width, height, tileX, prevTileY) ) {
 							break;
 						}
 					}
@@ -147,7 +147,7 @@ ig.CollisionMap = ig.Map.extend({
 					t = this.data[tileY][tileX];
 					if(
 						t == 1 || t > this.lastSlope || // fully solid tile?
-						(t > 1 && this._checkTileDef(res, t, x, y, rvx, rvy, width, height, tileX, tileY)) // slope?
+						(t > 1 && this._checkTileDef(res, t, x, y, vx, vy, width, height, tileX, tileY)) // slope?
 					) {
 						if( t > 1 && t <= this.lastSlope && res.collision.slope ) {
 							break;
@@ -274,4 +274,4 @@ ig.CollisionMap.staticNoCollision = { trace: function( x, y, vx, vy ) {
 	};
 }};
 
-});
\ No newline at end of file
+});