1 files changed, 1 insertions, 1 deletions

diff --git a/src/threading.h b/src/threading.h
index 2656dcc..768d61c 100644
--- a/src/threading.h
+++ b/src/threading.h
@@ -221,7 +221,7 @@ bool_t SIGNAL_WAIT( SIGNAL_T *ref, MUTEX_T *mu, time_d timeout );
                       void *data, int prio /* -2..+2 */ );
 
 # if defined(PLATFORM_LINUX)
-  volatile bool_t sudo;
+  extern volatile bool_t sudo;
 #  ifdef LINUX_SCHED_RR
 #   define THREAD_PRIO_MIN (sudo ? -3 : 0)
 #  else