diff --git a/source/cl_parse.c b/source/cl_parse.c
index 05563dc..0a62bfd 100644
--- a/source/cl_parse.c
+++ b/source/cl_parse.c
@@ -1612,6 +1612,11 @@ 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 24cc4b1..7df8c18 100644
--- a/source/pr_cmds.c
+++ b/source/pr_cmds.c
@@ -1368,6 +1368,33 @@ 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
@@ -4005,6 +4032,7 @@ static builtin_t pr_builtin[] =
 	PF_SetPlayerName, 			// #505
 	PF_SetDoubleTapVersion,		// #506
 	PF_ScreenFlash,				// #507
+	PF_LockViewmodel,			// #508
 };
 
 builtin_t *pr_builtins = pr_builtin;
diff --git a/source/protocol.h b/source/protocol.h
index 45b21f4..03bde61 100644
--- a/source/protocol.h
+++ b/source/protocol.h
@@ -227,6 +227,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #define	svc_updatekills		    53	    // [string] to put in center of the screen
 
 #define svc_screenflash			54 // [byte] color [byte] duration [byte] type
+#define svc_lockviewmodel		55
 
 //
 // client to server