diff --git a/src/osgUI/ComboBox.cpp b/src/osgUI/ComboBox.cpp
index 7ac4c3888..60cfe8224 100644
--- a/src/osgUI/ComboBox.cpp
+++ b/src/osgUI/ComboBox.cpp
@@ -21,7 +21,8 @@
 
 using namespace osgUI;
 
-ComboBox::ComboBox()
+ComboBox::ComboBox():
+    _currentItem(0)
 {
 }