diff --git a/.travis.yml b/.travis.yml
index 4dbc8177d6..ef2f27f37a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -384,8 +384,9 @@ script:
   - $SETARCH make -s test TESTOPTS="${TESTOPTS=$JOBS -q --tty=no}"
   - travis_wait 40 $SETARCH make -s test-all -o exts TESTOPTS="${TEST_ALL_OPTS=$TESTOPTS}" RUBYOPT="-w"
   - |-
-    [ -n "${TEST_ALL_ISOLATED_TESTS}" ] &&
-    $SETARCH make -s test-all -o exts TESTS="$TEST_ALL_ISOLATED_TESTS" RUBYOPT="-w"
+    if [ -n "${TEST_ALL_ISOLATED_TESTS}" ]; then
+      $SETARCH make -s test-all -o exts TESTS="$TEST_ALL_ISOLATED_TESTS" RUBYOPT="-w"
+    fi
   - $SETARCH make -s test-spec MSPECOPT=-ff # not using `-j` because sometimes `mspec -j` silently dies
 
 # Branch matrix.  Not all branches are Travis-ready so we limit branches here.