diff --git a/contrib/ports/unix/example_app/iteropts.sh b/contrib/ports/unix/example_app/iteropts.sh
index a1ca1d7c..44c0f39a 100755
--- a/contrib/ports/unix/example_app/iteropts.sh
+++ b/contrib/ports/unix/example_app/iteropts.sh
@@ -17,7 +17,7 @@ do
     rm $EXAPPDIR/lwipopts_test.h
     # cat the file to update its timestamp
     cat $f > $EXAPPDIR/lwipopts_test.h
-    make TESTFLAGS=-DLWIP_OPTTEST_FILE -Wno-documentation -j 8 1> $BUILDLOG 2>&1 || (RETVAL=1; echo file $f failed >> $LOGFILE; echo ++++++++ $f FAILED +++++++; cat $BUILDLOG)
+    make TESTFLAGS="-DLWIP_OPTTEST_FILE -Wno-documentation" -j 8 1> $BUILDLOG 2>&1 || (RETVAL=1; echo file $f failed >> $LOGFILE; echo ++++++++ $f FAILED +++++++; cat $BUILDLOG)
     echo test $f done >> $LOGFILE
 done
 echo done, cleaning
diff --git a/travis.sh b/travis.sh
index 34e41f7d..8e1c6666 100755
--- a/travis.sh
+++ b/travis.sh
@@ -45,3 +45,8 @@ fi
 cd ..
 cd contrib/ports/unix/example_app
 ./iteropts.sh
+ERR=$?
+if [ $ERR != 0 ]; then
+       echo "lwIP iteropts test failed"
+       exit 33
+fi