diff --git a/libgloss/ChangeLog b/libgloss/ChangeLog
index 6a3f797b7..9b37ea837 100644
--- a/libgloss/ChangeLog
+++ b/libgloss/ChangeLog
@@ -1,3 +1,10 @@
+2013-11-21  Marcus Shawcroft  <marcus.shawcroft@arm.com>
+
+	* aarch64/ftruncate.c: Include errno.h.
+	(ftruncate) Set errno.
+	* aarch64/truncate.c: Include errno.h.
+	(truncate) Set errno.
+
 2013-11-20  Marcus Shawcroft  <marcus.shawcroft@arm.com>
 
 	* arm/ftruncate.c: Include errno.h.
diff --git a/libgloss/aarch64/ftruncate.c b/libgloss/aarch64/ftruncate.c
index da46fc5d7..41a64d2ae 100644
--- a/libgloss/aarch64/ftruncate.c
+++ b/libgloss/aarch64/ftruncate.c
@@ -23,10 +23,12 @@
  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
+#include <errno.h>
 #include <sys/types.h>
 
 int
 ftruncate (int file, off_t length)
 {
+  errno = ENOSYS;
   return -1;
 }
diff --git a/libgloss/aarch64/truncate.c b/libgloss/aarch64/truncate.c
index d53394a67..92c0fcab3 100644
--- a/libgloss/aarch64/truncate.c
+++ b/libgloss/aarch64/truncate.c
@@ -23,10 +23,12 @@
  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
+#include <errno.h>
 #include <sys/types.h>
 
 int
 truncate (const char *path, off_t length)
 {
+  errno = ENOSYS;
   return -1;
 }