diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index c992a59d889e4a9d9617ee38878c3ed3b2f20626..aeb28376aac08a23806a23763e7fa5af3b96b735 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2016-03-01  Pedro Alves  <palves@redhat.com>
+
+	* gdb.trace/ftrace-lock.c: Include <unistd.h>.
+
 2016-03-01  Pedro Alves  <palves@redhat.com>
 
 	* gdb.threads/watchpoint-fork-child.c: Include "watchpoint-fork.h"
diff --git a/gdb/testsuite/gdb.trace/ftrace-lock.c b/gdb/testsuite/gdb.trace/ftrace-lock.c
index fd0d1f94aae9f9ecaff7fa311930dc6a8c1892be..ed07694553cb289ea757ab192176a82669cac2de 100644
--- a/gdb/testsuite/gdb.trace/ftrace-lock.c
+++ b/gdb/testsuite/gdb.trace/ftrace-lock.c
@@ -16,6 +16,7 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <pthread.h>
+#include <unistd.h>
 #include "trace-common.h"
 
 /* Called if the testcase failed.  */