diff --git a/src/hash/dbo_hash.h b/src/hash/dbo_hash.h
index 2e58627..16c15b3 100644
--- a/src/hash/dbo_hash.h
+++ b/src/hash/dbo_hash.h
@@ -106,7 +106,7 @@ public:
     inline bool remove(KT key)
     {
         struct dbo_hash_slot<KT, VT> *slot;
-        if (! search(key, &slot))
+        if (! this->search(key, &slot))
             return false;
         slot->key = deletedKey;
         slot->value->release();
@@ -136,7 +136,7 @@ public:
     inline void put(KT key, zmm::Ref<VT> value)
     {
         struct dbo_hash_slot<KT, VT> *slot;
-        search(key, &slot);
+        this->search(key, &slot);
         put(key, (hash_slot_t)slot, value);
     }
     void put(KT key, hash_slot_t destSlot, zmm::Ref<VT> value)
@@ -162,7 +162,7 @@ public:
     inline zmm::Ref<VT> get(KT key)
     {
         struct dbo_hash_slot<KT, VT> *slot;
-        bool found = search(key, &slot);
+        bool found = this->search(key, &slot);
         if (found)
             return zmm::Ref<VT>(slot->value);
         else
@@ -174,7 +174,7 @@ public:
     inline zmm::Ref<VT> get(KT key, hash_slot_t *destSlot)
     {
         struct dbo_hash_slot<KT, VT> **slot = (struct dbo_hash_slot<KT, VT> **)destSlot;
-        bool found = search(key, slot);
+        bool found = this->search(key, slot);
         if (found)
             return zmm::Ref<VT>((*slot)->value);
         else
diff --git a/src/hash/dbr_hash.h b/src/hash/dbr_hash.h
index 6e65d7f..7028890 100644
--- a/src/hash/dbr_hash.h
+++ b/src/hash/dbr_hash.h
@@ -124,7 +124,7 @@ public:
     inline bool remove(KT key)
     {
         struct dbr_hash_slot<KT> *slot;
-        if (! search(key, &slot))
+        if (! this->search(key, &slot))
             return false;
         slot->key = deletedKey;
         int array_slot = slot->array_slot;
@@ -134,7 +134,7 @@ public:
             return true;
         }
         data_array[array_slot] = data_array[--this->count];
-        if (! search(data_array[array_slot], &slot))
+        if (! this->search(data_array[array_slot], &slot))
         {
             log_debug("DBR-Hash-Error: (%d; array_slot=%d; count=%d)\n", data_array[array_slot], array_slot, this->count);
             throw zmm::Exception(_("DBR-Hash-Error: key in data_array not found in hashtable"));
@@ -146,7 +146,7 @@ public:
     inline void put(KT key)
     {
         struct dbr_hash_slot<KT> *slot;
-        if (! search(key, &slot))
+        if (! this->search(key, &slot))
         {
 #ifdef TOMBDEBUG
             if (this->count >= realCapacity)
@@ -194,7 +194,7 @@ public:
     inline bool exists(KT key)
     {
         struct dbr_hash_slot<KT> *slot;
-        return search(key, &slot);
+        return this->search(key, &slot);
     }
     
     /*
diff --git a/src/hash/dso_hash.h b/src/hash/dso_hash.h
index adfb97f..03ec852 100644
--- a/src/hash/dso_hash.h
+++ b/src/hash/dso_hash.h
@@ -100,7 +100,7 @@ public:
     inline bool remove(zmm::String key)
     {
         struct dso_hash_slot<VT> *slot;
-        if (! search(key, &slot))
+        if (! this->search(key, &slot))
             return false;
         slot->key->release();
         slot->value->release();
@@ -112,7 +112,7 @@ public:
     inline void put(zmm::String key, zmm::Ref<VT> value)
     {
         struct dso_hash_slot<VT> *slot;
-        search(key, &slot);
+        this->search(key, &slot);
         put(key, (hash_slot_t)slot, value);
     }
     void put(zmm::String key, hash_slot_t destSlot, zmm::Ref<VT> value)
@@ -141,7 +141,7 @@ public:
     inline zmm::Ref<VT> get(zmm::String key)
     {
         struct dso_hash_slot<VT> *slot;
-        bool found = search(key, &slot);
+        bool found = this->search(key, &slot);
         if (found)
             return zmm::Ref<VT>(slot->value);
         else
@@ -153,7 +153,7 @@ public:
     inline zmm::Ref<VT> get(zmm::String key, hash_slot_t *destSlot)
     {
         struct dso_hash_slot<VT> **slot = (struct dso_hash_slot<VT> **)destSlot;
-        bool found = search(key, slot);
+        bool found = this->search(key, slot);
         if (found)
             return zmm::Ref<VT>((*slot)->value);
         else