diff --git a/include/linux/x86/syscall.h b/include/linux/x86/syscall.h
index 4414d3c1..eb776be0 100644
--- a/include/linux/x86/syscall.h
+++ b/include/linux/x86/syscall.h
@@ -78,6 +78,7 @@
 #define SYS_geteuid   0x31
 #define SYS_getegid   0x32
 #define SYS_setgid    0x3e
+#define SYS_getppid   0x40
 
 // make+POSIX
 #define SYS_sigprocmask 0x7e
diff --git a/include/linux/x86_64/syscall.h b/include/linux/x86_64/syscall.h
index 5737ecbb..269546e2 100644
--- a/include/linux/x86_64/syscall.h
+++ b/include/linux/x86_64/syscall.h
@@ -75,6 +75,7 @@
 #define SYS_setgid    0x6a
 #define SYS_geteuid   0x6b
 #define SYS_getegid   0x6c
+#define SYS_getppid   0x6e
 
 // make+POSIX
 #define SYS_rt_sigprocmask 0x0e
diff --git a/lib/linux/gnu.c b/lib/linux/gnu.c
index 7d4f08c5..325eb247 100644
--- a/lib/linux/gnu.c
+++ b/lib/linux/gnu.c
@@ -169,6 +169,12 @@ getegid ()
   return _sys_call (SYS_getegid);
 }
 
+pid_t
+getppid ()
+{
+  return _sys_call (SYS_getppid);
+}
+
 int
 setuid (uid_t newuid)
 {