diff --git a/source/network/NetMessageSim.cpp b/source/network/NetMessageSim.cpp
index f18aa76b7b..7214bf3eb8 100644
--- a/source/network/NetMessageSim.cpp
+++ b/source/network/NetMessageSim.cpp
@@ -15,6 +15,8 @@
  * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "precompiled.h"
+
 #include "NetMessage.h"
 
 #include "scriptinterface/ScriptInterface.h"