diff --git a/app/src/main/cpp/PhoneDevice.cpp b/app/src/main/cpp/PhoneDevice.cpp
index fb0373ae..2a912ceb 100644
--- a/app/src/main/cpp/PhoneDevice.cpp
+++ b/app/src/main/cpp/PhoneDevice.cpp
@@ -973,7 +973,7 @@ bool CPhoneDevice::OnImageReady(cv::Mat& mat)
         }
     }
 
-    int thickness2 = 6 * ratio;
+    int thickness2 = 4 * ratio;
     if (thickness2 < 2) thickness2 = 2;
     int thickness1 = 2 * ratio;
     if (thickness1 < 1) thickness1 = 1;