diff --git a/modules/gui/src/tools/tool_manager.cc b/modules/gui/src/tools/tool_manager.cc
index 249c3a0cee51e94383434c725016065eb7d9cc39..55cd23137718132713e340713dff29f1fc89d8ab 100644
--- a/modules/gui/src/tools/tool_manager.cc
+++ b/modules/gui/src/tools/tool_manager.cc
@@ -68,8 +68,7 @@ Tool* ToolManager::GetActiveTool() const
   return active_tool_;
 }
 
-ToolManager::ToolManager()
-{
+ToolManager::ToolManager(): active_tool_(NULL) {
   
 }