diff --git a/src/blitz/protocol/PacketFactory.cpp b/src/blitz/protocol/PacketFactory.cpp
index 71f8c7a..ca88d8c 100644
--- a/src/blitz/protocol/PacketFactory.cpp
+++ b/src/blitz/protocol/PacketFactory.cpp
@@ -1,6 +1,7 @@
 #include <blitz/protocol/PacketFactory.h>
 
 #include <array>
+#include <cassert>
 #include <functional>
 
 namespace blitz {