diff --git a/scripts/dev/ci/travis_install.sh b/scripts/dev/ci/travis_install.sh
index 32b44bca1..f6a6feb7e 100644
--- a/scripts/dev/ci/travis_install.sh
+++ b/scripts/dev/ci/travis_install.sh
@@ -18,25 +18,26 @@
 # along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
 
 # Stolen from https://github.com/travis-ci/travis-build/blob/master/lib/travis/build/templates/header.sh
+# and adjusted to use ((...))
 travis_retry() {
     local ANSI_RED="\033[31;1m"
     local ANSI_RESET="\033[0m"
     local result=0
     local count=1
-    while [ $count -le 3 ]; do
-        [ $result -ne 0 ] && {
+    while (( count < 3 )); do
+        if (( result != 0 )); then
             echo -e "\n${ANSI_RED}The command \"$@\" failed. Retrying, $count of 3.${ANSI_RESET}\n" >&2
-        }
+        fi
         "$@"
         result=$?
-        [ $result -eq 0 ] && break
+        (( result == 0 )) && break
         count=$(($count + 1))
         sleep 1
     done
 
-    [ $count -gt 3 ] && {
+    if (( count > 3 )); then
         echo -e "\n${ANSI_RED}The command \"$@\" failed 3 times.${ANSI_RESET}\n" >&2
-    }
+    fi
 
     return $result
 }