diff --git a/src/Fl_Color_Chooser.cxx b/src/Fl_Color_Chooser.cxx
index 65f0c3031..88a3b0461 100644
--- a/src/Fl_Color_Chooser.cxx
+++ b/src/Fl_Color_Chooser.cxx
@@ -251,7 +251,7 @@ static void generate_image(void* vv, int X, int Y, int W, uchar* buf) {
   for (int x = X; x < X+W; x++) {
     double Xf = double(x)/iw;
     double H,S; tohs(Xf,Yf,H,S);
-    double r,g,b;
+    double r=0, g=0, b=0;
     Fl_Color_Chooser::hsv2rgb(H,S,V,r,g,b);
     *buf++ = uchar(255*r+.5);
     *buf++ = uchar(255*g+.5);