diff --git a/source/cl_parse.c b/source/cl_parse.c
index 2fc0e0b..873e3ac 100644
--- a/source/cl_parse.c
+++ b/source/cl_parse.c
@@ -1244,6 +1244,11 @@ void CL_ParseServerMessage (void)
 			doubletap_has_damage_buff = MSG_ReadByte();
 			break;
 
+		case svc_lockviewmodel:
+			// This platform doesn't use this.
+			MSG_ReadByte();
+			break;
+
 		case svc_screenflash:
 			screenflash_color = MSG_ReadByte();
 			screenflash_duration = sv.time + MSG_ReadByte();
diff --git a/source/pr_cmds.c b/source/pr_cmds.c
index d8ea282..8630815 100644
--- a/source/pr_cmds.c
+++ b/source/pr_cmds.c
@@ -3379,6 +3379,33 @@ void PF_ScreenFlash(void)
 	}
 }
 
+/*
+=================
+PF_LockViewmodel
+
+Server tells client to lock their
+viewmodel in place, if applicable.
+
+nzp_lockviewmodel()
+=================
+*/
+void PF_LockViewmodel(void)
+{
+	client_t	*client;
+	int			entnum;
+	int 		state;
+
+	entnum = G_EDICTNUM(OFS_PARM0);
+	state = G_FLOAT(OFS_PARM1);
+
+	if (entnum < 1 || entnum > svs.maxclients)
+		return;
+
+	client = &svs.clients[entnum-1];
+	MSG_WriteByte (&client->message, svc_lockviewmodel);
+	MSG_WriteByte (&client->message, state);
+}
+
 /*
 =================
 PF_BettyPrompt
@@ -3790,7 +3817,8 @@ ebfs_builtin_t pr_ebfs_builtins[] =
   { 504, "nzp_bettyprompt", PF_BettyPrompt },
   { 505, "nzp_setplayername", PF_SetPlayerName },
   { 506, "nzp_setdoubletapver", PF_SetDoubleTapVersion },
-  { 507, "nzp_screenflash", PF_ScreenFlash }
+  { 507, "nzp_screenflash", PF_ScreenFlash },
+  { 508, "nzp_lockviewmodel", PF_LockViewmodel }
 
 // 2001-11-15 DarkPlaces general builtin functions by Lord Havoc  end
 
diff --git a/source/protocol.h b/source/protocol.h
index bedc2ca..8e16a38 100644
--- a/source/protocol.h
+++ b/source/protocol.h
@@ -160,6 +160,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #define svc_playername 		48
 #define svc_doubletap		49
 #define svc_screenflash		50		// [byte] color [byte] duration [byte] type
+#define svc_lockviewmodel	51
 
 //
 // client to server