diff --git a/modules/line_descriptor/src/draw.cpp b/modules/line_descriptor/src/draw.cpp
index bfd1680a2..1319c4767 100644
--- a/modules/line_descriptor/src/draw.cpp
+++ b/modules/line_descriptor/src/draw.cpp
@@ -166,7 +166,7 @@ void drawKeylines( const Mat& image, const std::vector<KeyLine>& keylines, Mat&
   {
     /* decide lines' color  */
     Scalar lineColor;
-    if( color != Scalar::all( -1 ) )
+    if( color == Scalar::all( -1 ) )
     {
       int R = ( rand() % (int) ( 255 + 1 ) );
       int G = ( rand() % (int) ( 255 + 1 ) );