diff --git a/input/driver.hpp b/input/driver.hpp
index d95fa206e1..1c1e950478 100644
--- a/input/driver.hpp
+++ b/input/driver.hpp
@@ -23,6 +23,7 @@ namespace Mangle
      */
     struct Driver
     {
+      Driver() : event(NULL) {}
       virtual ~Driver() {}
 
       /** Captures input and produces the relevant events from it. An