diff --git a/static/scripts/docker-tcp.sh b/static/scripts/docker-tcp.sh
index c2174ff..0fd75e6 100755
--- a/static/scripts/docker-tcp.sh
+++ b/static/scripts/docker-tcp.sh
@@ -77,7 +77,7 @@ echo extendedKeyUsage = serverAuth >> extfile.cnf
 # Generate server-side certificate
 openssl x509 \
     -req \
-    -days "$DAYS" \
+    -days "$days" \
     -sha256 \
     -in server.csr \
     -CA ca.pem \
@@ -104,7 +104,7 @@ echo extendedKeyUsage = clientAuth > extfile-client.cnf
 # Generate certificate
 openssl x509 \
     -req \
-    -days "$DAYS" \
+    -days "$days" \
     -sha256 \
     -in client.csr \
     -CA ca.pem \