diff --git a/Gui/VtkVis/VtkImageDataToLinePolyDataFilter.cpp b/Gui/VtkVis/VtkImageDataToLinePolyDataFilter.cpp
index 3196ddf2201c3d88b914b05104a994d4bc034cde..364a1039b6c8e0b6bd5ad9efc5fdde999ef168b4 100644
--- a/Gui/VtkVis/VtkImageDataToLinePolyDataFilter.cpp
+++ b/Gui/VtkVis/VtkImageDataToLinePolyDataFilter.cpp
@@ -27,7 +27,8 @@
 
 vtkStandardNewMacro(VtkImageDataToLinePolyDataFilter);
 
-VtkImageDataToLinePolyDataFilter::VtkImageDataToLinePolyDataFilter()
+VtkImageDataToLinePolyDataFilter::VtkImageDataToLinePolyDataFilter() :
+		ImageSpacing(0.0)
 {
 	this->SetLengthScaleFactor(1.0);
 }