diff --git a/Tests/Fixtures/escapedCharacters.yml b/Tests/Fixtures/escapedCharacters.yml
index 6ca044c8..cc0356d3 100644
--- a/Tests/Fixtures/escapedCharacters.yml
+++ b/Tests/Fixtures/escapedCharacters.yml
@@ -4,7 +4,7 @@ yaml: |
 php: |
     "\\0 \\ \\a \\b \\n"
 ---
-test: null
+test: 'null'
 yaml: |
     "\0"
 php: |