2 files changed, 1 insertions, 2 deletions

diff --git a/src/sysdep.c b/src/sysdep.c
index e223a67787d..9522aa4b04b 100644
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -1671,7 +1671,7 @@ emacs_sigaction_init (struct sigaction *action, signal_handler_t handler)
 }
 
 #ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
-pthread_t main_thread_id;
+static pthread_t main_thread_id;
 #endif
 
 /* SIG has arrived at the current process.  Deliver it to the main
diff --git a/src/syssignal.h b/src/syssignal.h
index 61e1c5f60e8..b43a2562e3d 100644
--- a/src/syssignal.h
+++ b/src/syssignal.h
@@ -32,7 +32,6 @@ extern void unblock_tty_out_signal (sigset_t const *);
 
 #ifdef HAVE_PTHREAD
 #include <pthread.h>
-extern pthread_t main_thread_id;
 /* If defined, asynchronous signals delivered to a non-main thread are
    forwarded to the main thread.  */
 #define FORWARD_SIGNAL_TO_MAIN_THREAD