diff --git a/sapi/fuzzer/generate_unserialize_dict.php b/sapi/fuzzer/generate_unserialize_dict.php
index cf270788d39..9ea53ed8054 100644
--- a/sapi/fuzzer/generate_unserialize_dict.php
+++ b/sapi/fuzzer/generate_unserialize_dict.php
@@ -3,7 +3,7 @@
 $dict = "";
 foreach (get_declared_classes() as $class) {
     $len = strlen($class);
-    $dict .= "\"$len:\\\"$class\\\"\"\n";
+    $dict .= "\"$len:\\\"" . addslashes($class) . "\\\"\"\n";
 }
 
 file_put_contents(__DIR__ . "/dict/unserialize", $dict);