diff --git a/README.md b/README.md
index be17ee8..5722cf6 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
 # nrpe-bird
 
-Collection of scripts used to monitor bird sessions and route limits
\ No newline at end of file
+Collection of scripts used to monitor bird sessions and route limits
+
+It’s not well tested against bird2 yet, but using -4 for either IPv4 and IPv6
+should be sufficient.
diff --git a/check_bgp b/check_bgp
index 426813b..8b7fbd5 100755
--- a/check_bgp
+++ b/check_bgp
@@ -99,11 +99,26 @@ STATE="$($birdc show protocol ${SESSION} | \
 
 ROUTE_LIMIT_IN="$($birdc show protocol all ${SESSION} | \
 	awk '/Receive limit/ { print $3 }')"
+
+# Test if we are on a bird2
+if [ -z ${ROUTE_LIMIT_IN} ]; then
+	ROUTE_LIMIT_IN="$($birdc show protocol all ${SESSION} | \
+		awk '/Import limit/ { print $3 }')"
+fi
+
+# There is no import limit, so no ratio either
+if [ -z ${ROUTE_LIMIT_IN} ]; then
+	RATIO_IN=0
+fi
+
 ROUTES_IMPORTED="$($birdc show protocol all ${SESSION} | grep 'Routes:' | \
 	sed -Ee '/imported/{ s/^.* ([0-9]+) imported.*$/\1/; p;}' -e d)"
 ROUTE_HIT_IN="$($birdc show protocol all ${SESSION} | \
 	grep -E 'Receive limit:.*HIT')"
-RATIO_IN=$(echo "(${ROUTES_IMPORTED}*100)/${ROUTE_LIMIT_IN}" | bc)
+
+if [ ! -z ${ROUTE_LIMIT_IN} ]; then
+	RATIO_IN=$(echo "(${ROUTES_IMPORTED}*100)/${ROUTE_LIMIT_IN}" | bc)
+fi
 
 ROUTE_HIT_OUT="$($birdc show protocol all ${SESSION} | \
 	grep -E 'Export limit:.*HIT')"