diff --git a/src/calibration.cpp b/src/calibration.cpp
index a3418b3..4b4c266 100644
--- a/src/calibration.cpp
+++ b/src/calibration.cpp
@@ -24,7 +24,11 @@ void Create_ColorBar()
         pColor[ba * 3 + 1] = S[s / 13];
         pColor[ba * 3 + 2] = V[v / 13 / 3];
     }
-    cv::cvtColor(color, color_bar, CV_HSV2BGR);
+    #if (CV_VERSION_MAJOR >= 4)
+        cv::cvtColor(color, color_bar, cv::COLOR_HSV2BGR);
+    #else
+        cv::cvtColor(color, color_bar, COLOR_HSV2BGR);
+    #endif
 }
 
 
@@ -647,4 +651,4 @@ bool Calibrator::ProjectOnImage(const Eigen::Vector4f &vec, const Eigen::Matrix4
     if (x >= -margin && x < IMG_W + margin && y >= -margin && y < IMG_H + margin)
         return true;
     return false;
-}
\ No newline at end of file
+}