diff --git a/src/common/engine/i_interface.cpp b/src/common/engine/i_interface.cpp
index 217f9212f..13d35a3a9 100644
--- a/src/common/engine/i_interface.cpp
+++ b/src/common/engine/i_interface.cpp
@@ -1,6 +1,8 @@
 #include "i_interface.h"
 #include "st_start.h"
 
+static_assert(sizeof(void*) == 8, "32 builds are not supported");
+
 // Some global engine variables taken out of the backend code.
 FStartupScreen* StartWindow;
 SystemCallbacks sysCallbacks;