diff --git a/hw/boards.h b/hw/boards.h
index 7fb2df5..659c559 100644
--- a/hw/boards.h
+++ b/hw/boards.h
@@ -15,7 +15,7 @@
     const char *desc;
     QEMUMachineInitFunc *init;
 #define RAMSIZE_FIXED	(1 << 0)
-    size_t ram_require;
+    ram_addr_t ram_require;
     struct QEMUMachine *next;
 } QEMUMachine;