diff --git a/include/sigar.h b/include/sigar.h
index b2266c6e..5355b87d 100644
--- a/include/sigar.h
+++ b/include/sigar.h
@@ -464,6 +464,10 @@ sigar_file_system_usage_get(sigar_t *sigar,
                             const char *dirname,
                             sigar_file_system_usage_t *fsusage);
 
+SIGAR_DECLARE(int) sigar_disk_usage_get(sigar_t *sigar,
+                                        const char *name,
+                                        sigar_disk_usage_t *usage);
+
 SIGAR_DECLARE(int)
 sigar_file_system_ping(sigar_t *sigar,
                        sigar_file_system_t *fs);
diff --git a/src/os/darwin/darwin_sigar.c b/src/os/darwin/darwin_sigar.c
index 57d91add..8db2f7be 100644
--- a/src/os/darwin/darwin_sigar.c
+++ b/src/os/darwin/darwin_sigar.c
@@ -1535,6 +1535,12 @@ int sigar_file_system_list_get(sigar_t *sigar,
     return SIGAR_OK;
 }
 
+int sigar_disk_usage_get(sigar_t *sigar, const char *name,
+                         sigar_disk_usage_t *usage)
+{
+    return SIGAR_ENOTIMPL;
+}
+
 int sigar_file_system_usage_get(sigar_t *sigar,
                                 const char *dirname,
                                 sigar_file_system_usage_t *fsusage)
diff --git a/src/os/hpux/hpux_sigar.c b/src/os/hpux/hpux_sigar.c
index 3412fb0c..512fc9fe 100644
--- a/src/os/hpux/hpux_sigar.c
+++ b/src/os/hpux/hpux_sigar.c
@@ -592,6 +592,12 @@ static int create_fsdev_cache(sigar_t *sigar)
     return SIGAR_OK;
 }
 
+int sigar_disk_usage_get(sigar_t *sigar, const char *name,
+                         sigar_disk_usage_t *usage)
+{
+    return SIGAR_ENOTIMPL;
+}
+
 int sigar_file_system_usage_get(sigar_t *sigar,
                                 const char *dirname,
                                 sigar_file_system_usage_t *fsusage)
diff --git a/src/os/linux/linux_sigar.c b/src/os/linux/linux_sigar.c
index f3c8fdff..e50ae393 100644
--- a/src/os/linux/linux_sigar.c
+++ b/src/os/linux/linux_sigar.c
@@ -1508,8 +1508,8 @@ static int get_iostat_procp(sigar_t *sigar,
     return ENOENT;
 }
 
-static int sigar_disk_usage_get(sigar_t *sigar, const char *name,
-                                sigar_disk_usage_t *usage)
+int sigar_disk_usage_get(sigar_t *sigar, const char *name,
+                         sigar_disk_usage_t *usage)
 {
     SIGAR_DISK_STATS_NOTIMPL(usage); /* init */
 
diff --git a/src/os/netware/netware_sigar.c b/src/os/netware/netware_sigar.c
index 7d1a9745..0cf1d229 100644
--- a/src/os/netware/netware_sigar.c
+++ b/src/os/netware/netware_sigar.c
@@ -314,6 +314,12 @@ int sigar_file_system_list_get(sigar_t *sigar,
     return SIGAR_OK;
 }
 
+int sigar_disk_usage_get(sigar_t *sigar, const char *name,
+                         sigar_disk_usage_t *usage)
+{
+    return SIGAR_ENOTIMPL;
+}
+
 #define SIGAR_FS_BLOCKS_TO_BYTES(buf, f) \
     ((buf.f * (buf.f_bsize / 512)) >> 1)
 
diff --git a/src/os/osf1/osf1_sigar.c b/src/os/osf1/osf1_sigar.c
index 8f329ffd..922657e3 100644
--- a/src/os/osf1/osf1_sigar.c
+++ b/src/os/osf1/osf1_sigar.c
@@ -452,6 +452,12 @@ int sigar_file_system_list_get(sigar_t *sigar,
     return SIGAR_OK;
 }
 
+int sigar_disk_usage_get(sigar_t *sigar, const char *name,
+                         sigar_disk_usage_t *usage)
+{
+    return SIGAR_ENOTIMPL;
+}
+
 #define SIGAR_FS_BLOCKS_TO_BYTES(buf, f) \
     (((sigar_uint64_t)buf.f * (buf.f_bsize / 512)) >> 1)
 
diff --git a/src/os/stub/stub_sigar.c b/src/os/stub/stub_sigar.c
index 0cde1c94..23fcc325 100644
--- a/src/os/stub/stub_sigar.c
+++ b/src/os/stub/stub_sigar.c
@@ -188,6 +188,12 @@ int sigar_file_system_list_get(sigar_t *sigar,
     return SIGAR_OK;
 }
 
+int sigar_disk_usage_get(sigar_t *sigar, const char *name,
+                         sigar_disk_usage_t *usage)
+{
+    return SIGAR_ENOTIMPL;
+}
+
 int sigar_file_system_usage_get(sigar_t *sigar,
                                 const char *dirname,
                                 sigar_file_system_usage_t *fsusage)
diff --git a/src/os/win32/win32_sigar.c b/src/os/win32/win32_sigar.c
index bd64a446..74f5bbcd 100644
--- a/src/os/win32/win32_sigar.c
+++ b/src/os/win32/win32_sigar.c
@@ -1780,9 +1780,9 @@ static PERF_INSTANCE_DEFINITION *get_disk_instance(sigar_t *sigar,
     return PdhFirstInstance(object);
 }
 
-static int sigar_disk_usage_get(sigar_t *sigar,
-                                const char *dirname,
-                                sigar_disk_usage_t *fsusage)
+SIGAR_DECLARE(int) sigar_disk_usage_get(sigar_t *sigar,
+                                        const char *dirname,
+                                        sigar_disk_usage_t *fsusage)
 {
     DWORD i, err;
     PERF_OBJECT_TYPE *object =