diff --git a/common.h b/common.h
index 581cd0c..83ead0c 100644
--- a/common.h
+++ b/common.h
@@ -25,11 +25,13 @@
 #define PREFIX ""
 #endif
 
-enum {
+enum verbose {
    MBOX_LOG_NONE = 0,
    MBOX_LOG_INFO = 1,
    MBOX_LOG_DEBUG = 2
-} verbosity;
+};
+
+extern enum verbose verbosity;
 
 /* Error Messages */
 #define MSG_ERR(f_, ...)	mbox_log(LOG_ERR, f_, ##__VA_ARGS__)
@@ -42,7 +44,7 @@
 					mbox_log(LOG_DEBUG, f_, ##__VA_ARGS__); \
 				} } while(0)
 
-void (*mbox_vlog)(int p, const char *fmt, va_list args);
+extern void (*mbox_vlog)(int p, const char *fmt, va_list args);
 
 void mbox_log_console(int p, const char *fmt, va_list args);