diff --git a/rdma.ifup-ib b/rdma.ifup-ib
index 9efea51..7200e60 100644
--- a/rdma.ifup-ib
+++ b/rdma.ifup-ib
@@ -233,11 +233,12 @@ else
 	fi
 
 	if ! LC_ALL=C ip addr ls ${REALDEVICE} | LC_ALL=C grep -q "${ipaddr[$idx]}/${prefix[$idx]}" ; then
-	    [ "${REALDEVICE}" != "lo" ] && [ "${arpcheck[$idx]}" != "no" ] && \
-	    /sbin/arping -q -c 2 -w 3 -D -I ${REALDEVICE} ${ipaddr[$idx]}
-	    if [ $? = 1 ]; then
-		net_log $"Error, some other host already uses address ${ipaddr[$idx]}."
-		exit 1
+	    if [ "${REALDEVICE}" != "lo" ] && [ "${arpcheck[$idx]}" != "no" ]; then
+	        /sbin/arping -q -c 2 -w 3 -D -I ${REALDEVICE} ${ipaddr[$idx]}
+	        if [ $? = 1 ]; then
+		    net_log $"Error, some other host already uses address ${ipaddr[$idx]}."
+		    exit 1
+	        fi
 	    fi
 	   
 	    if ! ip addr add ${ipaddr[$idx]}/${prefix[$idx]} \