diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index 733bfe006e2a..160ca997e8ee 100644
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,8 @@
+2018-11-26  Matthias Klose <doko@ubuntu.com>
+
+	PR ada/88191
+	* libgnarl/s-linux__alpha.ads: Define SIGSYS.
+
 2018-11-19  Alexandre Oliva <oliva@adacore.com>
 
 	PR ada/81878
diff --git a/gcc/ada/libgnarl/s-linux__alpha.ads b/gcc/ada/libgnarl/s-linux__alpha.ads
index 96602ca7dc1a..0f01f30094e6 100644
--- a/gcc/ada/libgnarl/s-linux__alpha.ads
+++ b/gcc/ada/libgnarl/s-linux__alpha.ads
@@ -87,6 +87,7 @@ package System.Linux is
    SIGKILL    : constant := 9; --  kill (cannot be caught or ignored)
    SIGBUS     : constant := 10; --  bus error
    SIGSEGV    : constant := 11; --  segmentation violation
+   SIGSYS     : constant := 12; --  bad system call
    SIGPIPE    : constant := 13; --  write on a pipe with no one to read it
    SIGALRM    : constant := 14; --  alarm clock
    SIGTERM    : constant := 15; --  software termination signal from kill