diff --git a/src/os/aix/aix_sigar.c b/src/os/aix/aix_sigar.c
index f9b61c26..435b7e94 100644
--- a/src/os/aix/aix_sigar.c
+++ b/src/os/aix/aix_sigar.c
@@ -1644,6 +1644,10 @@ static int get_perfstat_disk_metrics(sigar_t *sigar,
     fsusage->disk_reads = disk.rblks;
     fsusage->disk_writes = disk.wblks;
 
+    fsusage->disk_read_bytes  = SIGAR_FIELD_NOTIMPL;
+    fsusage->disk_write_bytes = SIGAR_FIELD_NOTIMPL;
+    fsusage->disk_queue       = SIGAR_FIELD_NOTIMPL;
+
     return SIGAR_OK;
 }
 
@@ -1679,6 +1683,9 @@ static int get_disk_metrics(sigar_t *sigar,
         if (strEQ(diskio->name, dkstat.diskname)) {
             fsusage->disk_reads = dkstat.dk_rblks;
             fsusage->disk_writes = dkstat.dk_wblks;
+            fsusage->disk_read_bytes  = SIGAR_FIELD_NOTIMPL;
+            fsusage->disk_write_bytes = SIGAR_FIELD_NOTIMPL;
+            fsusage->disk_queue       = SIGAR_FIELD_NOTIMPL;
             status = SIGAR_OK;
         }
         else {
@@ -1710,6 +1717,9 @@ static int get_disk_metrics(sigar_t *sigar,
         if (strEQ(diskio->name, dkstat.diskname)) {
             fsusage->disk_reads = dkstat.dk_rblks;
             fsusage->disk_writes = dkstat.dk_wblks;
+            fsusage->disk_read_bytes  = SIGAR_FIELD_NOTIMPL;
+            fsusage->disk_write_bytes = SIGAR_FIELD_NOTIMPL;
+            fsusage->disk_queue       = SIGAR_FIELD_NOTIMPL;
             diskio->addr = (long)dp;
             break;
         }
diff --git a/src/os/darwin/darwin_sigar.c b/src/os/darwin/darwin_sigar.c
index 62a28414..517f704d 100644
--- a/src/os/darwin/darwin_sigar.c
+++ b/src/os/darwin/darwin_sigar.c
@@ -1083,6 +1083,9 @@ int sigar_file_system_usage_get(sigar_t *sigar,
 #else
     fsusage->disk_reads  = buf.f_syncreads + buf.f_asyncreads;
     fsusage->disk_writes = buf.f_syncwrites + buf.f_asyncwrites;
+    fsusage->disk_read_bytes  = SIGAR_FIELD_NOTIMPL;
+    fsusage->disk_write_bytes = SIGAR_FIELD_NOTIMPL;
+    fsusage->disk_queue       = SIGAR_FIELD_NOTIMPL;
 #endif
 
     return SIGAR_OK;
diff --git a/src/os/hpux/hpux_sigar.c b/src/os/hpux/hpux_sigar.c
index ef13d0ee..c81406b8 100644
--- a/src/os/hpux/hpux_sigar.c
+++ b/src/os/hpux/hpux_sigar.c
@@ -627,6 +627,9 @@ int sigar_file_system_usage_get(sigar_t *sigar,
         if (retval == 1) {
             fsusage->disk_reads  = lv.psl_rxfer;
             fsusage->disk_writes = lv.psl_wxfer;
+            fsusage->disk_read_bytes  = SIGAR_FIELD_NOTIMPL;
+            fsusage->disk_write_bytes = SIGAR_FIELD_NOTIMPL;
+            fsusage->disk_queue       = SIGAR_FIELD_NOTIMPL;
         }
     }
 
diff --git a/src/os/linux/linux_sigar.c b/src/os/linux/linux_sigar.c
index 342d3a1e..b4895866 100644
--- a/src/os/linux/linux_sigar.c
+++ b/src/os/linux/linux_sigar.c
@@ -1076,6 +1076,10 @@ static int get_iostat_sys(sigar_t *sigar,
     ptr = sigar_skip_token(ptr);
     fsusage->disk_writes = sigar_strtoul(ptr);
 
+    fsusage->disk_read_bytes  = SIGAR_FIELD_NOTIMPL;
+    fsusage->disk_write_bytes = SIGAR_FIELD_NOTIMPL;
+    fsusage->disk_queue       = SIGAR_FIELD_NOTIMPL;
+
     return SIGAR_OK;
 }
 
@@ -1112,6 +1116,9 @@ static int get_iostat_procp(sigar_t *sigar,
             /* rmerge, rsect, ruse */
             ptr = sigar_skip_multiple_token(ptr, 3);
             fsusage->disk_writes = sigar_strtoul(ptr); /* wio */
+            fsusage->disk_read_bytes  = SIGAR_FIELD_NOTIMPL;
+            fsusage->disk_write_bytes = SIGAR_FIELD_NOTIMPL;
+            fsusage->disk_queue       = SIGAR_FIELD_NOTIMPL;
             fclose(fp);
             return SIGAR_OK;
         }
diff --git a/src/os/solaris/solaris_sigar.c b/src/os/solaris/solaris_sigar.c
index 2f997734..3b5238a0 100644
--- a/src/os/solaris/solaris_sigar.c
+++ b/src/os/solaris/solaris_sigar.c
@@ -1320,6 +1320,10 @@ static int fs_kstat_read(sigar_t *sigar,
     kstat_read(sigar->kc, ksp, &io);
     fsusage->disk_reads  = io.reads;
     fsusage->disk_writes = io.writes;
+    fsusage->disk_read_bytes  = SIGAR_FIELD_NOTIMPL;
+    fsusage->disk_write_bytes = SIGAR_FIELD_NOTIMPL;
+    fsusage->disk_queue       = SIGAR_FIELD_NOTIMPL;
+
     return SIGAR_OK;
 }