diff --git a/ext/liquid/tokenizer.c b/ext/liquid/tokenizer.c
index 9fa31ac..fa260df 100644
--- a/ext/liquid/tokenizer.c
+++ b/ext/liquid/tokenizer.c
@@ -5,7 +5,7 @@ extern VALUE mLiquid;
 
 static void free_tokenizer(void *ptr)
 {
-    struct liquid_tokenizer *tokenizer;
+    struct liquid_tokenizer *tokenizer = ptr;
     xfree(tokenizer);
 }