diff --git a/simgear/scene/tgdb/SGTileDetailsCallback.hxx b/simgear/scene/tgdb/SGTileDetailsCallback.hxx
index d7ffb5b1..44c7f86f 100644
--- a/simgear/scene/tgdb/SGTileDetailsCallback.hxx
+++ b/simgear/scene/tgdb/SGTileDetailsCallback.hxx
@@ -871,7 +871,7 @@ public:
         lightGroup->addChild(groundLights2);
       }
 
-      if (vasiLights.empty()) {
+      if (! vasiLights.empty()) {
         EffectGeode* vasiGeode = new EffectGeode;        
         Effect* vasiEffect = getLightEffect(24, osg::Vec3(1, 0.0001, 0.000001), 1, 24, true, _options);
         vasiGeode->setEffect(vasiEffect);
@@ -1137,4 +1137,4 @@ public:
     SGDirectionalLightListBin               holdshortLights;
     SGDirectionalLightListBin               guardLights;
     SGDirectionalLightListBin               reilLights;    
-};
\ No newline at end of file
+};