diff --git a/calibration.cpp b/calibration.cpp
index 45f19f9..1b99e5b 100644
--- a/calibration.cpp
+++ b/calibration.cpp
@@ -22,7 +22,7 @@ int main(int argc, char *argv[])
     }
 
     // Set the chessboard size (number of inner corners in width and height)
-    cv::Size chessboardSize(6, 9);
+    cv::Size chessboardSize(9, 6);
 
     cv::Size imgSize;