diff --git a/script/travis/before_install b/script/travis/before_install
index 93ef383c..516ec956 100755
--- a/script/travis/before_install
+++ b/script/travis/before_install
@@ -17,6 +17,9 @@ else
   bundle config build.charlock_holmes --with-icu-dir=$(pwd)/vendor/debs
 fi
 
+# Replace SSH links to submodules by HTTPS links.
+sed -i 's/git@github.com:/https:\/\/github.com\//' .gitmodules
+
 git submodule init
 git submodule sync --quiet
 script/fast-submodule-update