diff --git a/php/run-php-tests.sh b/php/run-php-tests.sh
index 53216bedb..169d24fe1 100755
--- a/php/run-php-tests.sh
+++ b/php/run-php-tests.sh
@@ -44,4 +44,4 @@ printenv | grep -E '^(LIBGUESTFS|LIBVIRT|LIBVIRTD|VIRTLOCKD|LD|MALLOC)_' >> env
 TESTS=$(echo tests/guestfs_php_*.phpt)
 echo TESTS: $TESTS
 
-make test TESTS="$TESTS" PHP_EXECUTABLE="$PWD/php-for-tests.sh" REPORT_EXIT_STATUS=1
+make test TESTS="$TESTS" PHP_EXECUTABLE="$PWD/php-for-tests.sh" REPORT_EXIT_STATUS=1 TEST_TIMEOUT=300