diff --git a/configs/config.prodrive_hermes b/configs/config.prodrive_hermes
index 34556cc3be..35c617c510 100644
--- a/configs/config.prodrive_hermes
+++ b/configs/config.prodrive_hermes
@@ -11,3 +11,5 @@ CONFIG_SMMSTORE_V2=y
 CONFIG_DEFAULT_CONSOLE_LOGLEVEL_3=y
 CONFIG_POST_DEVICE_LPC=y
 CONFIG_MAINBOARD_SERIAL_NUMBER="N/A"
+CONFIG_PCIEXP_SUPPORT_RESIZABLE_BARS=y
+CONFIG_PCIEXP_DEFAULT_MAX_RESIZABLE_BAR_BITS=36