Index: /trunk/src/VBox/Additions/common/VBoxGuest/VBoxGuest-darwin.cpp
===================================================================
--- /trunk/src/VBox/Additions/common/VBoxGuest/VBoxGuest-darwin.cpp	(revision 50721)
+++ /trunk/src/VBox/Additions/common/VBoxGuest/VBoxGuest-darwin.cpp	(revision 50722)
@@ -78,7 +78,9 @@
 # define MODULE_NAME "VBoxGuest"
 # define PDEBUG(fmt, args...) \
-     printf(MODULE_NAME ": DEBUG: %s:%d %s(): " fmt "\n", __FILE__, __LINE__, __FUNCTION__, ## args)
+  do { \
+      printf(MODULE_NAME ": DEBUG: %s:%d %s(): " fmt "\n", __FILE__, __LINE__, __FUNCTION__, ## args); \
+  } while (0)
 #else
-# define PDEBUG(fmt, args...) { ; }
+# define PDEBUG(fmt, args...) do {} while (0)
 #endif