diff --git a/.travis.yml b/.travis.yml
index aea8de6d7..480328a7c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ before_install:
 # ant-optional is needed for ant junit. This used to be part of the default
 # Travis image.
 - sudo apt-get install ant-optional
+- npm install -g is-ascii-safe-cli
 install:
 # Invoke the "travis" profile during Maven steps; see <profile> in pom.xml
 # files. This is configured not to build the "cpp-build" module.
@@ -16,3 +17,4 @@ script:
 - mvn -P travis test
 - ant clean -f java/build.xml && ant jar -f java/build.xml
 - ant junit -f java/build.xml
+- find . -name '*.js' ! -name '*_test.js' | xargs is-ascii-safe
diff --git a/javascript/i18n/phonenumbers/phonenumberutil.js b/javascript/i18n/phonenumbers/phonenumberutil.js
index a31f8865d..8f1ed1b90 100644
--- a/javascript/i18n/phonenumbers/phonenumberutil.js
+++ b/javascript/i18n/phonenumbers/phonenumberutil.js
@@ -3502,7 +3502,7 @@ i18n.phonenumbers.PhoneNumberUtil.prototype.isPossibleNumberForTypeWithReason =
   // getRegionCodeForNumber will not work if the number is possible but not
   // valid. There is in fact one country calling code (290) where the possible
   // number pattern differs between various regions (Saint Helena and Tristan
-  // da Cuñha), but this is handled by putting all possible lengths for any
+  // da Cunha), but this is handled by putting all possible lengths for any
   // country with this country calling code in the metadata for the default
   // region in this case.
   if (!this.hasValidCountryCallingCode_(countryCode)) {
@@ -3996,7 +3996,7 @@ i18n.phonenumbers.PhoneNumberUtil.prototype.checkRegionForParsing_ = function(
  * method is quite lenient and looks for a number in the input text (raw input)
  * and does not check whether the string is definitely only a phone number. To
  * do this, it ignores punctuation and white-space, as well as any text before
- * the number (e.g. a leading “Tel: ”) and trims the non-number bits.  It will
+ * the number (e.g. a leading "Tel: ") and trims the non-number bits.  It will
  * accept a number in any format (E164, national, international etc), assuming
  * it can be interpreted with the defaultRegion supplied. It also attempts to
  * convert any alpha characters into digits if it thinks this is a vanity number