diff --git a/src/r_defs.h b/src/r_defs.h
index d6c4b6221..2719ff7ee 100644
--- a/src/r_defs.h
+++ b/src/r_defs.h
@@ -1278,7 +1278,7 @@ struct line_t
 {
 	vertex_t	*v1, *v2;	// vertices, from v1 to v2
 private:
-	fixed_t 	dx, dy;		// precalculated v2 - v1 for side checking
+	DVector2	delta;		// precalculated v2 - v1 for side checking
 public:
 	DWORD		flags;
 	DWORD		activation;	// activation type
@@ -1294,19 +1294,12 @@ public:
 
 	DVector2 Delta() const
 	{
-		return{ FIXED2DBL(dx), FIXED2DBL(dy) };
-	}
-
-	void setDelta(fixed_t x, fixed_t y)
-	{
-		dx = x;
-		dy = y;
+		return delta;
 	}
 
 	void setDelta(double x, double y)
 	{
-		dx = FLOAT2FIXED(x);
-		dy = FLOAT2FIXED(y);
+		delta = { x, y };
 	}
 
 	void setAlpha(double a)