diff --git a/mandelbrot.cpp b/mandelbrot.cpp
index 2142c0b..3fa63ba 100644
--- a/mandelbrot.cpp
+++ b/mandelbrot.cpp
@@ -67,15 +67,15 @@ uint32_t Mandelbrotc::mandelbrot(const Vec2mp &n)
     // y.setValue(0.0);
 
     mpreal x = mpreal(0.0);
-    mpreal xtemp = mpreal(0.0);
     mpreal y = mpreal(0.0);
     mpreal x2 = mpreal(0.0);
     mpreal y2 = mpreal(0.0);
 
-    while (x*x + y*y <= 4 && iter < max_iter) {
-        xtemp = x*x - y*y + n.x; 
-        y = 2*x*y+n.y;
-        x = xtemp;
+    while (x2 + y2 <= 4 && iter < max_iter) {
+        y = 2.0 * x * y + n.y;
+        x = x2 - y2 + n.x;
+        x2 = x * x;
+        y2 = y * y;
 
         iter++;
     }