diff --git a/exec.c b/exec.c
index 31374da..cb9a7eb 100644
--- a/exec.c
+++ b/exec.c
@@ -410,7 +410,7 @@
         code_gen_buffer_size = DEFAULT_CODE_GEN_BUFFER_SIZE;
 #else
         /* XXX: needs ajustments */
-        code_gen_buffer_size = (int)(phys_ram_size / 4);
+        code_gen_buffer_size = (unsigned long)(phys_ram_size / 4);
 #endif
     }
     if (code_gen_buffer_size < MIN_CODE_GEN_BUFFER_SIZE)