diff --git a/hw/m68k/mcf5208.c b/hw/m68k/mcf5208.c
index ec14096aa4..0ad347dfa8 100644
--- a/hw/m68k/mcf5208.c
+++ b/hw/m68k/mcf5208.c
@@ -158,7 +158,7 @@ static uint64_t m5208_sys_read(void *opaque, hwaddr addr,
         {
             int n;
             for (n = 0; n < 32; n++) {
-                if (current_machine->ram_size < (2u << n)) {
+                if (current_machine->ram_size < (2ULL << n)) {
                     break;
                 }
             }