diff --git a/bindings/ruby/rbsigar.c b/bindings/ruby/rbsigar.c
index 7bfc7a7d..526125a9 100644
--- a/bindings/ruby/rbsigar.c
+++ b/bindings/ruby/rbsigar.c
@@ -684,6 +684,7 @@ static void Init_rbsigar_constants(VALUE rclass)
     RB_SIGAR_CONST_INT(IFF_MULTICAST);
     RB_SIGAR_CONST_INT(IFF_SLAVE);
     RB_SIGAR_CONST_INT(IFF_MASTER);
+    RB_SIGAR_CONST_INT(IFF_DYNAMIC);
 
     RB_SIGAR_CONST_INT(NETCONN_CLIENT);
     RB_SIGAR_CONST_INT(NETCONN_SERVER);
diff --git a/include/sigar.h b/include/sigar.h
index a09ecebd..d5f5d6a2 100644
--- a/include/sigar.h
+++ b/include/sigar.h
@@ -585,6 +585,7 @@ SIGAR_DECLARE(int) sigar_net_route_list_destroy(sigar_t *sigar,
 #define SIGAR_IFF_MULTICAST   0x800
 #define SIGAR_IFF_SLAVE       0x1000
 #define SIGAR_IFF_MASTER      0x2000
+#define SIGAR_IFF_DYNAMIC     0x4000
 
 #define SIGAR_NULL_HWADDR "00:00:00:00:00:00"
 
diff --git a/src/sigar.c b/src/sigar.c
index 9ab00450..a21808ae 100644
--- a/src/sigar.c
+++ b/src/sigar.c
@@ -1551,6 +1551,7 @@ int sigar_net_interface_config_get(sigar_t *sigar, const char *name,
         int is_mcast = flags & IFF_MULTICAST;
         int is_slave = flags & IFF_SLAVE;
         int is_master = flags & IFF_MASTER;
+        int is_dynamic = flags & IFF_DYNAMIC;
         /*
          * XXX: should just define SIGAR_IFF_*
          * and test IFF_* bits on given platform.
@@ -1568,6 +1569,9 @@ int sigar_net_interface_config_get(sigar_t *sigar, const char *name,
         if (is_master) {
             flags |= SIGAR_IFF_MASTER;
         }
+        if (is_dynamic) {
+            flags |= SIGAR_IFF_DYNAMIC;
+        }
 #endif
         ifconfig->flags = flags;
     }
diff --git a/src/sigar_format.c b/src/sigar_format.c
index ea7d5290..a719f6a0 100644
--- a/src/sigar_format.c
+++ b/src/sigar_format.c
@@ -559,6 +559,9 @@ SIGAR_DECLARE(char *) sigar_net_interface_flags_to_string(sigar_uint64_t flags,
     if (flags & SIGAR_IFF_MASTER) {
         strcat(buf, "MASTER ");
     }
+    if (flags & SIGAR_IFF_DYNAMIC) {
+        strcat(buf, "DYNAMIC ");
+    }
 
     return buf;
 }