diff --git a/Gui/VtkVis/VtkRaster.cpp b/Gui/VtkVis/VtkRaster.cpp
index c9ffd2e17b9148be5b2554f9c9f446810e765ac1..79aefde775256fc0d12eb5fc380a36cc3d4768df 100644
--- a/Gui/VtkVis/VtkRaster.cpp
+++ b/Gui/VtkVis/VtkRaster.cpp
@@ -402,7 +402,7 @@ vtkImageImport* VtkRaster::loadImageFromTIFF(const std::string &fileName,
 					_TIFFfree(pixVal);
 					GTIFFree(geoTiff);
 					XTIFFClose(tiff);
-					return false;
+					return NULL;
 				}
 
 			// check for colormap