diff --git a/cpp/SConscript b/cpp/SConscript
index 29bfea123..6cf9724b2 100644
--- a/cpp/SConscript
+++ b/cpp/SConscript
@@ -4,6 +4,7 @@ vars = Variables()
 vars.Add(BoolVariable('DEBUG', 'Set to disable optimizations', 1))
 vars.Add(BoolVariable('PIC', 'Set to 1 for to always generate PIC code', 0))
 env = Environment(variables = vars)
+# env.Replace(CXX = "clang++") 
 
 debug = env['DEBUG']
 compile_options = {}
diff --git a/cpp/core/src/zxing/qrcode/detector/Detector.cpp b/cpp/core/src/zxing/qrcode/detector/Detector.cpp
index 7fc0efe6b..527aadbb0 100644
--- a/cpp/core/src/zxing/qrcode/detector/Detector.cpp
+++ b/cpp/core/src/zxing/qrcode/detector/Detector.cpp
@@ -239,7 +239,7 @@ float Detector::sizeOfBlackWhiteBlackRun(int fromX, int fromY, int toX, int toY)
       int realY = steep ? x : y;
 
       // Does current pixel mean we have moved white to black or vice versa?
-      if (!(state == 1 ^ image_->get(realX, realY))) {
+      if (!((state == 1) ^ image_->get(realX, realY))) {
         if (state == 2) {
           int diffX = x - fromX;
           int diffY = y - fromY;