diff --git a/boofuzz/primitives/delim.py b/boofuzz/primitives/delim.py
index a0727676..35fc385a 100644
--- a/boofuzz/primitives/delim.py
+++ b/boofuzz/primitives/delim.py
@@ -45,6 +45,10 @@ def __init__(self, name=None, default_value=" ", *args, **kwargs):
         self._fuzz_library.append("*")
         self._fuzz_library.append("(")
         self._fuzz_library.append(")")
+        self._fuzz_library.append("{")
+        self._fuzz_library.append("}")
+        self._fuzz_library.append("[")
+        self._fuzz_library.append("]")
         self._fuzz_library.append("-")
         self._fuzz_library.append("_")
         self._fuzz_library.append("+")