diff --git a/src/node.c b/src/node.c
index 705f87a..8ec0aed 100644
--- a/src/node.c
+++ b/src/node.c
@@ -79,8 +79,8 @@ void r3_tree_free(node * tree) {
     if (tree->pcre_pattern) {
         pcre_free(tree->pcre_pattern);
     }
-    if (n->pcre_extra) {
-        pcre_free_study(n->pcre_extra);
+    if (tree->pcre_extra) {
+        pcre_free_study(tree->pcre_extra);
     }
     if (tree->combined_pattern)
         zfree(tree->combined_pattern);