diff --git a/checkin_notes b/checkin_notes
index bd5fddadba..2e10ed467b 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -997,3 +997,9 @@ David  24 Jan 2012
         client_types.h
     vda/
         vdad.cpp
+
+Charlie 25 Jan 2012
+    - VBOX: Fix compiler warnings on Mac.
+    
+    samples/vboxwrapper/
+        vboxwrapper.cpp
diff --git a/samples/vboxwrapper/vboxwrapper.cpp b/samples/vboxwrapper/vboxwrapper.cpp
index 8a07a092ba..13966cdcbb 100644
--- a/samples/vboxwrapper/vboxwrapper.cpp
+++ b/samples/vboxwrapper/vboxwrapper.cpp
@@ -513,8 +513,8 @@ int main(int argc, char** argv) {
                     boinc_msg_prefix(buf, sizeof(buf)),
                     system_log.c_str(),
                     vm_log.c_str(),
-                    vm_exit_code,
-                    vm_exit_code
+                    (unsigned int)vm_exit_code,
+                    (unsigned int)vm_exit_code
                 );
                 if (vm_exit_code) {
                     boinc_finish(vm_exit_code);