diff --git a/src/Lib/Polygon/polygon.cxx b/src/Lib/Polygon/polygon.cxx
index a5c159f1..5b93e407 100644
--- a/src/Lib/Polygon/polygon.cxx
+++ b/src/Lib/Polygon/polygon.cxx
@@ -159,10 +159,11 @@ bool FGPolygon::is_inside( int a, int b ) const {
 
     // B is "inside" A if the polygon_diff( B, A ) is not null.
     FGPolygon result = polygon_diff( B, A );
-    cout << "    is_inside() result = " << result.contours() << endl;
     if ( result.contours() == 0 ) {
+	cout << "    is_inside() result = true" << endl;
 	return true;
     }
+    cout << "    is_inside() result = false" << endl;
 
     return false;
 }