diff --git a/src/operators/fuzzy_hash.cc b/src/operators/fuzzy_hash.cc
index 705178ee..20228ab5 100644
--- a/src/operators/fuzzy_hash.cc
+++ b/src/operators/fuzzy_hash.cc
@@ -84,6 +84,17 @@ bool FuzzyHash::init(const std::string &param2, std::string *error) {
 #endif
 }
 
+FuzzyHash::~FuzzyHash() {
+    struct fuzzy_hash_chunk *c = m_head;
+    while (c) {
+        struct fuzzy_hash_chunk *t = c;
+        free(c->data);
+        c->data = NULL;
+        c = c->next;
+        free (t);
+    }
+    m_head = NULL;
+}
 
 
 bool FuzzyHash::evaluate(Transaction *t, const std::string &str) {
diff --git a/src/operators/fuzzy_hash.h b/src/operators/fuzzy_hash.h
index 9936e692..2bb94ff5 100644
--- a/src/operators/fuzzy_hash.h
+++ b/src/operators/fuzzy_hash.h
@@ -29,7 +29,7 @@ namespace operators {
 
 
 struct fuzzy_hash_chunk {
-    const char *data;
+    char *data;
     struct fuzzy_hash_chunk *next;
 };
 
@@ -44,6 +44,8 @@ class FuzzyHash : public Operator {
         : Operator("FuzzyHash", param),
         m_head(NULL),
         m_threshold(0) { }
+    ~FuzzyHash();
+
     bool evaluate(Transaction *transaction, const std::string &std) override;
 
     bool init(const std::string &param, std::string *error) override;