diff --git a/bindings/SigarWrapper.pm b/bindings/SigarWrapper.pm
index ef9d1e5c..3fb33397 100644
--- a/bindings/SigarWrapper.pm
+++ b/bindings/SigarWrapper.pm
@@ -631,12 +631,12 @@ use vars qw(%classes %cmds);
       {
          name => 'bytes_read', type => 'Long',
          desc => 'Bytes Read',
-         plat => 'L'
+         plat => 'LW'
       },
       {
          name => 'bytes_written', type => 'Long',
          desc => 'Bytes Written',
-         plat => 'L'
+         plat => 'LW'
       }
     ],
     ProcState => [
diff --git a/src/os/aix/aix_sigar.c b/src/os/aix/aix_sigar.c
index a4c0a88d..7f58b58e 100644
--- a/src/os/aix/aix_sigar.c
+++ b/src/os/aix/aix_sigar.c
@@ -754,6 +754,13 @@ int sigar_proc_mem_get(sigar_t *sigar, sigar_pid_t pid,
     return SIGAR_OK;
 }
 
+int sigar_proc_disk_io_get(sigar_t *sigar, sigar_pid_t pid,
+                           sigar_proc_disk_io_t *proc_disk_io)
+{
+    return SIGAR_ENOTIMPL;
+}
+
+
 int sigar_proc_cred_get(sigar_t *sigar, sigar_pid_t pid,
                         sigar_proc_cred_t *proccred)
 {
diff --git a/src/os/darwin/darwin_sigar.c b/src/os/darwin/darwin_sigar.c
index 0e154b09..8a80cd8f 100644
--- a/src/os/darwin/darwin_sigar.c
+++ b/src/os/darwin/darwin_sigar.c
@@ -1241,6 +1241,13 @@ int sigar_proc_mem_get(sigar_t *sigar, sigar_pid_t pid,
     return SIGAR_OK;
 }
 
+int sigar_proc_disk_io_get(sigar_t *sigar, sigar_pid_t pid,
+                           sigar_proc_disk_io_t *proc_disk_io)
+{
+    return SIGAR_ENOTIMPL;
+}
+
+
 int sigar_proc_cred_get(sigar_t *sigar, sigar_pid_t pid,
                         sigar_proc_cred_t *proccred)
 {
diff --git a/src/os/hpux/hpux_sigar.c b/src/os/hpux/hpux_sigar.c
index f7a7adce..d362b04e 100644
--- a/src/os/hpux/hpux_sigar.c
+++ b/src/os/hpux/hpux_sigar.c
@@ -307,6 +307,13 @@ int sigar_proc_mem_get(sigar_t *sigar, sigar_pid_t pid,
     return SIGAR_OK;
 }
 
+int sigar_proc_disk_io_get(sigar_t *sigar, sigar_pid_t pid, 
+                           sigar_proc_disk_io_t *proc_disk_io)
+{
+    return SIGAR_ENOTIMPL;
+}
+
+
 int sigar_proc_cred_get(sigar_t *sigar, sigar_pid_t pid,
                         sigar_proc_cred_t *proccred)
 {
diff --git a/src/os/solaris/solaris_sigar.c b/src/os/solaris/solaris_sigar.c
index da9a2b63..8e8726e0 100644
--- a/src/os/solaris/solaris_sigar.c
+++ b/src/os/solaris/solaris_sigar.c
@@ -719,6 +719,12 @@ int sigar_proc_mem_get(sigar_t *sigar, sigar_pid_t pid,
     return SIGAR_OK;
 }
 
+int sigar_proc_disk_io_get(sigar_t *sigar, sigar_pid_t pid, 
+                           sigar_proc_disk_io_t *proc_disk_io)
+{
+    return SIGAR_ENOTIMPL;
+}
+
 int sigar_proc_cred_get(sigar_t *sigar, sigar_pid_t pid,
                         sigar_proc_cred_t *proccred)
 {