diff --git a/campaign.cfg b/campaign.cfg
index 1568de2..21bba19 100644
--- a/campaign.cfg
+++ b/campaign.cfg
@@ -4,6 +4,7 @@
 # by using this file, internal structure of era can be changed
 # without breaking compatibility with campaigns
 
+#ifndef MULTIPLAYER
 [binary_path]
     path=data/add-ons/Archaic_Era/
 [/binary_path]
@@ -21,3 +22,10 @@
     {~add-ons/Archaic_Era/units/ukians_race.cfg}
     {~add-ons/Archaic_Era/units/south-seas_race.cfg}
 [/units]
+#else
+# in multiplayercampaigns, this era's units and binary_path are known to all add-ons (in difference to the macros)
+# only if you use [advancefrom] or extra_defines= for custom units it may (or may not) be needed to read that unit(s) again
+{~add-ons/Archaic_Era/mainline-strings.cfg}
+{~add-ons/Archaic_Era/utils}
+#    {~add-ons/Archaic_Era/theme.cfg}
+#endif