diff --git a/llama_cpp/llama_grammar.py b/llama_cpp/llama_grammar.py
index 45a1513..60d5194 100644
--- a/llama_cpp/llama_grammar.py
+++ b/llama_cpp/llama_grammar.py
@@ -58,7 +58,7 @@ class LlamaGrammar:
         )  # type: std.vector[std.vector[LlamaGrammarElement]]
         self._n_rules = self._grammar_rules.size()  # type: int
         self._start_rule_index = parsed_grammar.symbol_ids.at("root")  # type: int
-        self.grammar = self.init()
+        self.init()
 
     @classmethod
     def from_string(cls, grammar: str, verbose: bool = True) -> "LlamaGrammar":
diff --git a/tests/test_grammar.py b/tests/test_grammar.py
new file mode 100644
index 0000000..2e24903
--- /dev/null
+++ b/tests/test_grammar.py
@@ -0,0 +1,13 @@
+import llama_cpp
+
+tree = """
+leaf ::= "."
+node ::= leaf | "(" node node ")"
+root ::= node
+"""
+
+def test_grammar_from_string():
+    grammar = llama_cpp.LlamaGrammar.from_string(tree)
+    assert grammar._n_rules == 3
+    assert grammar._start_rule_index == 2
+    assert grammar.grammar is not None