diff --git a/release/install-release.sh b/release/install-release.sh
index f1f08ae9..1327f031 100755
--- a/release/install-release.sh
+++ b/release/install-release.sh
@@ -99,6 +99,7 @@ downloadV2Ray(){
         colorEcho ${RED} "Failed to download! Please check your network or try again."
         return 3
     fi
+    return 0
 }
 
 installSoftware(){
@@ -125,6 +126,7 @@ installSoftware(){
         colorEcho ${RED} "Install ${COMPONENT} fail, please install it manually."
         return 2
     fi
+    return 0
 }
 
 # return 1: not apt or yum
@@ -138,6 +140,7 @@ getPMT(){
     else
         return 1
     fi
+    return 0
 }
 
 
@@ -149,6 +152,7 @@ extract(){
         colorEcho ${RED} "Extracting V2Ray failed!"
         return 2
     fi
+    return 0
 }
 
 
@@ -243,6 +247,7 @@ installV2Ray(){
       colorEcho ${GREEN} "UUID:${UUID}"
       mkdir -p /var/log/v2ray
     fi
+    return 0
 }