diff --git a/network/netplay/netplay_private.h b/network/netplay/netplay_private.h
index e0794f0faa..8e94904caa 100644
--- a/network/netplay/netplay_private.h
+++ b/network/netplay/netplay_private.h
@@ -62,6 +62,7 @@
 /* Mapping of serialization quirks to netplay quirks. */
 #define NETPLAY_QUIRK_MAP_UNDERSTOOD \
    (RETRO_SERIALIZATION_QUIRK_INCOMPLETE \
+   |RETRO_SERIALIZATION_QUIRK_CORE_VARIABLE_SIZE \
    |RETRO_SERIALIZATION_QUIRK_MUST_INITIALIZE \
    |RETRO_SERIALIZATION_QUIRK_SINGLE_SESSION \
    |RETRO_SERIALIZATION_QUIRK_ENDIAN_DEPENDENT \