1 files changed, 1 insertions, 1 deletions

diff --git a/mps/code/libcbt.c b/mps/code/libcbt.c
index 9090eb8a6d5..7e13734ecf8 100644
--- a/mps/code/libcbt.c
+++ b/mps/code/libcbt.c
@@ -42,7 +42,7 @@ int main(void)
   die(mps_lib_callback_register("mps_clock",
     (mps_lib_function_t)libcbt_clock),
     "register clock");
-  die(mps_arena_create(&arena, mps_arena_class_vm(), 1000*1000),
+  die(mps_arena_create(&arena, mps_arena_class_vm(), (size_t)1000*1000),
     "mps_arena_create");
   if(defects) {
     printf("Conclusion: Defects detected.\n");