diff --git a/alethzero/MainWin.h b/alethzero/MainWin.h
index 50b9df413..fffc5843f 100644
--- a/alethzero/MainWin.h
+++ b/alethzero/MainWin.h
@@ -33,6 +33,7 @@
 #include <libdevcore/RLP.h>
 #include <libethcore/CommonEth.h>
 #include <libethereum/State.h>
+#include <libethereum/Executive.h>
 #include <libqethereum/QEthereum.h>
 #include <libwebthree/WebThree.h>