diff --git a/wled00/FX.cpp b/wled00/FX.cpp
index a2ceb591a..a0d080818 100644
--- a/wled00/FX.cpp
+++ b/wled00/FX.cpp
@@ -7737,9 +7737,9 @@ uint16_t mode_2Doctopus() {
     const int C_Y = (rows / 2) + ((SEGMENT.custom2 - 128)*rows)/255;
     for (int x = 0; x < cols; x++) {
       for (int y = 0; y < rows; y++) {
-        rMap[XY(x, y)].angle  = int(40.7436f * atan2_t((y - C_Y), (x - C_X)));  // avoid 128*atan2()/PI
         int dx = (x - C_X);
         int dy = (y - C_Y);
+        rMap[XY(x, y)].angle  = int(40.7436f * atan2_t(dy, dx));  // avoid 128*atan2()/PI
         rMap[XY(x, y)].radius = sqrtf(dx * dx + dy * dy) * mapp; //thanks Sutaburosu
       }
     }