diff --git a/core/linux-trimslice/config b/core/linux-trimslice/config
index 47114d3f8..f9c530cec 100644
--- a/core/linux-trimslice/config
+++ b/core/linux-trimslice/config
@@ -1528,7 +1528,7 @@ CONFIG_PPP_ASYNC=m
 CONFIG_PPP_SYNC_TTY=m
 CONFIG_PPP_DEFLATE=m
 CONFIG_PPP_BSDCOMP=m
-# CONFIG_PPP_MPPE is not set
+CONFIG_PPP_MPPE=m
 # CONFIG_PPPOE is not set
 # CONFIG_PPPOLAC is not set
 # CONFIG_PPPOPNS is not set