diff --git a/bash_tools.sh b/bash_tools.sh
index c0d8479..d805ca7 100644
--- a/bash_tools.sh
+++ b/bash_tools.sh
@@ -1,4 +1,3 @@
-source bash_tools/helper.sh
 # args:
 # $1: 
 # The IP address you want to query geo info for.
@@ -7,6 +6,8 @@ source bash_tools/helper.sh
 # doc for api: https://ip-api.com/docs/api
 DOT_FILE_DIR=$(dirname ${BASH_SOURCE[0]})/
 
+source $DOT_FILE_DIR/bash_tools/helper.sh
+
 function ipinfo(){
     local api_str="http://ip-api.com/json/$1?fields=query,country,regionName,city,district,zip,isp,org,reverse,mobile,proxy,hosting"
     if ! hash python; then
@@ -36,7 +37,6 @@ function dict(){
     fi
 }
 
-
 # Linux specific functions
 if [[ "$OSTYPE" == "linux-gnu"* ]]; then
 
diff --git a/bash_tools/helper.sh b/bash_tools/helper.sh
index c0413d2..35e6870 100644
--- a/bash_tools/helper.sh
+++ b/bash_tools/helper.sh
@@ -1,3 +1,7 @@
+# get self-host server ip
 SERVERIP=x.useless.pw
-ip=$(ifconfig | grep -Po 10.0.0.[01][0-9]+)
+
+$(which ifconfig > /dev/null 2>&1) && \
+    ip=$(ifconfig | grep -Po "10.0.0.[01][0-9]+")
+
 [ "$ip" != "" ] && SERVERIP=10.0.0.100