diff --git a/src/sv_main.c b/src/sv_main.c
index 7bf151f0..77477c59 100644
--- a/src/sv_main.c
+++ b/src/sv_main.c
@@ -194,6 +194,10 @@ cvar_t sv_pext_mvdsv_serversideweapon = { "sv_pext_mvdsv_serversideweapon", "1"
 
 cvar_t sv_extlimits = { "sv_extlimits", "2" };
 
+#if defined(FTE_PEXT_TRANS)
+cvar_t sv_pext_ezquake_verfortrans = {"pext_ezquake_verfortrans", "7814", CVAR_NONE};
+#endif
+
 qbool sv_error = false;
 
 client_t *WatcherId = NULL; // QW262
@@ -3507,6 +3511,10 @@ void SV_InitLocal (void)
 	Cvar_Register (&sv_pext_mvdsv_serversideweapon);
 #endif
 
+#ifdef FTE_PEXT_TRANS
+	Cvar_Register(&sv_pext_ezquake_verfortrans);
+#endif
+
 	Cvar_Register (&sv_reliable_sound);
 
 	Cvar_Register(&qws_name);
diff --git a/src/sv_user.c b/src/sv_user.c
index 71f6d70d..79da10e3 100644
--- a/src/sv_user.c
+++ b/src/sv_user.c
@@ -352,6 +352,33 @@ static void Cmd_New_f (void)
 	}
 #endif
 
+#if defined(FTE_PEXT_TRANS)
+	if (sv_client->fteprotocolextensions & FTE_PEXT_TRANS)
+	{
+		const char *client_string = Info_Get(&sv_client->_userinfo_ctx_, "*client");
+		char *ptr = strchr(client_string, ' ');
+		if (ptr != NULL) {
+			ptr++;
+			if (strncmp(client_string, "ezQuake", 7) == 0 && *ptr != '\0')
+			{
+				extern cvar_t sv_pext_ezquake_verfortrans;
+				char *endptr;
+				long revision = strtol(ptr, &endptr, 10);
+				if (*endptr != '\0' || (revision > 0 && revision < sv_pext_ezquake_verfortrans.value))
+				{
+					SV_ClientPrintf(sv_client, PRINT_HIGH, "\n\nWARNING:\n"
+						"Alpha support disabled due to buggy client, "
+						"if the map contains transparency you may be at a disadvantage.\n"
+						"Please upgrade to one of the following:\n"
+						"> ezQuake (https://www.ezquake.com)\n"
+						"> FTEQW (http://fte.triptohell.info/)\n");
+					sv_client->fteprotocolextensions &= ~FTE_PEXT_TRANS;
+				}
+			}
+		}
+	}
+#endif
+
 	//NOTE:  This doesn't go through ClientReliableWrite since it's before the user
 	//spawns.  These functions are written to not overflow
 	if (sv_client->num_backbuf)