diff --git a/lib/subnet.sh b/lib/subnet.sh
index 67d69ff..c5f3924 100644
--- a/lib/subnet.sh
+++ b/lib/subnet.sh
@@ -4,9 +4,9 @@
 . ./lib/colors.sh
 
 function check_subnet_exist {
-    vpc_name="${1}"
-    subnet_name="${2}"
-    vxlan_id="${3}"
+    local vpc_name="${1}"
+    local subnet_name="${2}"
+    local vxlan_id="${3}"
 
     print_in_color "${COLOR_GREY}" "Check in db if ${subnet_name} exist"
     check_in_db subnet "${subnet_name};${vpc_name}"
@@ -22,12 +22,12 @@ function check_subnet_exist {
 }
 
 function create_subnet {
-    vpc_name="${1}"
-    subnet_name="${2}"
-    vxlan_id="${3}"
-    local_ip="${4}"
-    gateway_ip="${5}"
-    subnet="${6}"
+    local vpc_name="${1}"
+    local subnet_name="${2}"
+    local vxlan_id="${3}"
+    local local_ip="${4}"
+    local gateway_ip="${5}"
+    local subnet="${6}"
 
     check_subnet_exist "${vpc_name}" "${subnet_name}"
     [ "$?" -eq "0" ] && \
diff --git a/lib/vpc.sh b/lib/vpc.sh
index 3d92913..498fe65 100644
--- a/lib/vpc.sh
+++ b/lib/vpc.sh
@@ -5,7 +5,7 @@
 . ./lib/colors.sh
 
 function check_vpc_exist {
-    vpc_name=${1}
+    local vpc_name=${1}
 
     print_in_color "${COLOR_GREY}" "Check in db if ${vpc_name} exist"
     check_in_db vpc "${vpc_name}"
@@ -17,7 +17,7 @@ function check_vpc_exist {
 }
 
 function create_vpc {
-    vpc_name="${1}"
+    local vpc_name="${1}"
 
     check_vpc_exist "${vpc_name}"
     [ "$?" -eq "0" ] && \
@@ -33,7 +33,7 @@ function create_vpc {
 }
 
 function delete_vpc {
-    vpc_name="${1}"
+    local vpc_name="${1}"
 
     
     print_in_color "${COLOR_RED}" "Delete ${vpc_name}"