diff --git a/.travis.yml b/.travis.yml
index d70b7e49..94848c17 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -44,8 +44,8 @@ script:
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then shellcheck -e SC2021,SC2126,SC2034 **/*.sh && echo "shellcheck OK" ; fi
   - cd ..
   - git clone https://github.com/Neilpang/acmetest.git && cp -r acme.sh acmetest/ && cd acmetest
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo NGROK_TOKEN="$NGROK_TOKEN" ./letest.sh ; fi
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then sudo NGROK_TOKEN="$NGROK_TOKEN" OPENSSL_BIN="$OPENSSL_BIN" ./letest.sh ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]] && [[ "$NGROK_TOKEN" ]]; then sudo NGROK_TOKEN="$NGROK_TOKEN" ./letest.sh ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]] && [[ "$NGROK_TOKEN" ]]; then sudo NGROK_TOKEN="$NGROK_TOKEN" OPENSSL_BIN="$OPENSSL_BIN" ./letest.sh ; fi
 
 
 matrix: