diff --git a/lib/posix/_getppid.c b/lib/posix/_getppid.c
index 7cc5c574c..a2a0f618e 100755
--- a/lib/posix/_getppid.c
+++ b/lib/posix/_getppid.c
@@ -11,6 +11,6 @@ PUBLIC pid_t getppid()
    * are not always successful and Minix returns the reserved value
    * (pid_t) -1 when there is an error.
    */
-  if (_syscall(MM, GETPID, &m) < 0) return ( (pid_t) -1);
+  if (_syscall(MM, MINIX_GETPID, &m) < 0) return ( (pid_t) -1);
   return( (pid_t) m.m2_i1);
 }
diff --git a/lib/posix/_ptrace.c b/lib/posix/_ptrace.c
index 35c13aed8..d4d7f52b9 100755
--- a/lib/posix/_ptrace.c
+++ b/lib/posix/_ptrace.c
@@ -12,7 +12,7 @@ long data;
 
   m.m2_i1 = pid;
   m.m2_i2 = req;
-  m.m2_l1 = addr;
+  m.PMTRACE_ADDR = addr;
   m.m2_l2 = data;
   if (_syscall(MM, PTRACE, &m) < 0) return(-1);