diff --git a/common/xrdp_constants.h b/common/xrdp_constants.h
index 4d44dabe..1302b1af 100644
--- a/common/xrdp_constants.h
+++ b/common/xrdp_constants.h
@@ -671,12 +671,12 @@
 #define LICENCE_SIGNATURE_SIZE         16
 
 
-/* RDP PDU codes */
-#define RDP_PDU_DEMAND_ACTIVE          1
-#define RDP_PDU_CONFIRM_ACTIVE         3
-#define RDP_PDU_REDIRECT               4
-#define RDP_PDU_DEACTIVATE             6
-#define RDP_PDU_DATA                   7
+/* PDU Types (MS-RDPBCGR 2.2.8.1.1.1.1) */
+#define PDUTYPE_DEMANDACTIVEPDU        0x1
+#define PDUTYPE_CONFIRMACTIVEPDU       0x3
+#define PDUTYPE_DEACTIVATEALLPDU       0x6
+#define PDUTYPE_DATAPDU                0x7
+#define PDUTYPE_SERVER_REDIR_PKT       0xA
 
 /* See T.128 */
 /* not used anywhere */
diff --git a/libxrdp/libxrdp.c b/libxrdp/libxrdp.c
index 2720fab2..f82ae953 100644
--- a/libxrdp/libxrdp.c
+++ b/libxrdp/libxrdp.c
@@ -230,10 +230,10 @@ libxrdp_process_data(struct xrdp_session *session, struct stream *s)
             case 0:
                 dead_lock_counter++;
                 break;
-            case RDP_PDU_CONFIRM_ACTIVE: /* 3 */
+            case PDUTYPE_CONFIRMACTIVEPDU:
                 xrdp_caps_process_confirm_active(rdp, s);
                 break;
-            case RDP_PDU_DATA: /* 7 */
+            case PDUTYPE_DATAPDU:
                 if (xrdp_rdp_process_data(rdp, s) != 0)
                 {
                     DEBUG(("libxrdp_process_data returned non zero"));
diff --git a/libxrdp/xrdp_caps.c b/libxrdp/xrdp_caps.c
index f1983421..529eeeaa 100644
--- a/libxrdp/xrdp_caps.c
+++ b/libxrdp/xrdp_caps.c
@@ -1024,7 +1024,7 @@ xrdp_caps_send_demand_active(struct xrdp_rdp *self)
     caps_count_ptr[2] = caps_count >> 16;
     caps_count_ptr[3] = caps_count >> 24;
 
-    if (xrdp_rdp_send(self, s, RDP_PDU_DEMAND_ACTIVE) != 0)
+    if (xrdp_rdp_send(self, s, PDUTYPE_DEMANDACTIVEPDU) != 0)
     {
         free_stream(s);
         return 1;
diff --git a/libxrdp/xrdp_rdp.c b/libxrdp/xrdp_rdp.c
index ff099da9..e4ee660f 100644
--- a/libxrdp/xrdp_rdp.c
+++ b/libxrdp/xrdp_rdp.c
@@ -561,7 +561,7 @@ xrdp_rdp_send_data(struct xrdp_rdp *self, struct stream *s,
     DEBUG(("in xrdp_rdp_send_data"));
     s_pop_layer(s, rdp_hdr);
     len = (int)(s->end - s->p);
-    pdutype = 0x10 | RDP_PDU_DATA;
+    pdutype = 0x10 | PDUTYPE_DATAPDU;
     pdulen = len;
     dlen = len;
     ctype = 0;
@@ -1296,7 +1296,7 @@ xrdp_rdp_send_deactivate(struct xrdp_rdp *self)
 
     s_mark_end(s);
 
-    if (xrdp_rdp_send(self, s, RDP_PDU_DEACTIVATE) != 0)
+    if (xrdp_rdp_send(self, s, PDUTYPE_DEACTIVATEALLPDU) != 0)
     {
         free_stream(s);
         DEBUG(("out xrdp_rdp_send_deactivate error"));