diff -r 5c995a647735 -r d3b2571c378b core/smn_banning.cpp
--- a/core/smn_banning.cpp	Sun Feb 08 15:40:48 2009 -0500
+++ b/core/smn_banning.cpp	Wed Feb 18 02:19:22 2009 -0600
@@ -268,6 +268,7 @@
 	ban_flags = params[3];
 	ban_source = params[7];
 
+#if SOURCE_ENGINE != SE_DARKMESSIAH
 	/* Check how we should ban the player */
 	if ((ban_flags & BANFLAG_AUTO) == BANFLAG_AUTO)
 	{
@@ -303,6 +304,11 @@
 	{
 		return pContext->ThrowNativeError("No valid ban method flags specified");
 	}
+#else
+	/* Dark Messiah doesn't have Steam IDs so there is only one ban method to choose */
+	ban_flags |= BANFLAG_IP;
+	ban_flags &= ~BANFLAG_AUTHID;
+#endif
 
 	cell_t handled = 0;
 	if (ban_cmd[0] != '\0' && g_pOnBanClient->GetFunctionCount() > 0)