diff --git a/src/mm-serial-port.c b/src/mm-serial-port.c
index 87f06e27..2971273e 100644
--- a/src/mm-serial-port.c
+++ b/src/mm-serial-port.c
@@ -767,6 +767,10 @@ data_available (GIOChannel *source,
     if (info && (info->started == TRUE) && (info->done == FALSE))
         return TRUE;
 
+    /* Don't steal data from PPP if we're connected */
+    if (mm_port_get_connected (MM_PORT (self)))
+        return TRUE;
+
     do {
         GError *err = NULL;