diff --git a/src/util/obj_hashtable.h b/src/util/obj_hashtable.h
index 5020377e0..0b39163ea 100644
--- a/src/util/obj_hashtable.h
+++ b/src/util/obj_hashtable.h
@@ -62,10 +62,6 @@ public:
     struct key_data {
         Key * m_key = nullptr;
         Value m_value;
-        key_data() = default;
-        key_data(Key* k): m_key(k) {}
-        key_data(Key* k, Value const& v): m_key(k), m_value(v) {}
-        key_data(Key* k, Value&& v): m_key(k), m_value(std::move(v)) {}
         Value const & get_value() const { return m_value; }
         Key & get_key () const { return *m_key; }
         unsigned hash() const { return m_key->hash(); }
@@ -136,15 +132,15 @@ public:
     }
     
     void insert(Key * const k, Value const & v) {
-        m_table.insert(key_data(k, v));
+        m_table.insert(key_data{k, v});
     }
 
     void insert(Key * const k, Value && v) {
-        m_table.insert(key_data(k, std::move(v)));
+        m_table.insert(key_data{k, std::move(v)});
     }
     
     Value& insert_if_not_there(Key * k, Value const & v) {
-        return m_table.insert_if_not_there2(key_data(k, v))->get_data().m_value;
+        return m_table.insert_if_not_there2(key_data{k, v})->get_data().m_value;
     }
 
     Value& insert_if_not_there(Key * k, Value && v) {
@@ -194,7 +190,7 @@ public:
     }
     
     iterator find_iterator(Key * k) const { 
-        return m_table.find(key_data(k));
+        return m_table.find(key_data{k});
     }
 
     bool contains(Key * k) const { 
@@ -202,7 +198,7 @@ public:
     }
 
     void remove(Key * k) {
-        m_table.remove(key_data(k));
+        m_table.remove(key_data{k});
     }
     
     void erase(Key * k) {
@@ -213,7 +209,7 @@ public:
 
     void get_collisions(Key * k, vector<Key*>& collisions) {
         vector<key_data> cs;
-        m_table.get_collisions(key_data(k), cs);
+        m_table.get_collisions(key_data{k}, cs);
         for (key_data const& kd : cs) {
             collisions.push_back(kd.m_key);
         }
diff --git a/src/util/obj_pair_hashtable.h b/src/util/obj_pair_hashtable.h
index e9d2e9bb5..78355b9bb 100644
--- a/src/util/obj_pair_hashtable.h
+++ b/src/util/obj_pair_hashtable.h
@@ -59,17 +59,13 @@ protected:
     class entry;
 public:
     class key_data {
-        Key1 *   m_key1;
-        Key2 *   m_key2;
+        Key1 *   m_key1 = nullptr;
+        Key2 *   m_key2 = nullptr;
         Value    m_value;
-        unsigned m_hash;
+        unsigned m_hash = 0;
         friend class entry;
     public:
-        key_data():
-            m_key1(nullptr),
-            m_key2(nullptr),
-            m_hash(0) {
-        }
+        key_data() = default;
         key_data(Key1 * k1, Key2 * k2):
             m_key1(k1), 
             m_key2(k2) {
diff --git a/src/util/obj_triple_hashtable.h b/src/util/obj_triple_hashtable.h
index 7d75084fe..00a7a2845 100644
--- a/src/util/obj_triple_hashtable.h
+++ b/src/util/obj_triple_hashtable.h
@@ -60,19 +60,14 @@ protected:
     class entry;
 public:
     class key_data {
-        Key1 *   m_key1;
-        Key2 *   m_key2;
-        Key3 *   m_key3;
+        Key1 *   m_key1 = nullptr;
+        Key2 *   m_key2 = nullptr;
+        Key3 *   m_key3 = nullptr;
         Value    m_value;
-        unsigned m_hash;
+        unsigned m_hash = 0;
         friend class entry;
     public:
-        key_data():
-            m_key1(nullptr),
-            m_key2(nullptr),
-            m_key3(nullptr),
-            m_hash(0) {
-        }
+        key_data() = default;
         key_data(Key1 * k1, Key2 * k2, Key3 * k3):
             m_key1(k1), 
             m_key2(k2),
diff --git a/src/util/symbol_table.h b/src/util/symbol_table.h
index 5d2cce726..c6dbb9f82 100644
--- a/src/util/symbol_table.h
+++ b/src/util/symbol_table.h
@@ -30,17 +30,6 @@ class symbol_table {
     struct key_data {
         symbol   m_key;
         T        m_data;
-     
-        key_data() = default;
-
-        explicit key_data(symbol k):
-            m_key(k) {
-        }
-        
-        key_data(symbol k, const T & d):
-            m_key(k), 
-            m_data(d) {
-        }
     };
 
     struct key_data_hash_proc { 
@@ -129,7 +118,7 @@ public:
     }
     
     bool contains(symbol key) const { 
-        return m_sym_table.contains(key_data(key)); 
+        return m_sym_table.contains(key_data{key});
     }
 
     unsigned get_scope_level() const { 
@@ -148,11 +137,11 @@ public:
                 m_trail_stack.push_back(dummy);
                 key_data & new_entry = m_trail_stack.back();
                 new_entry.m_key = symbol::mark(new_entry.m_key);
-                m_sym_table.insert(key_data(key, data));
+                m_sym_table.insert(key_data{key, data});
             }
         }
         else {
-            m_sym_table.insert(key_data(key, data));
+            m_sym_table.insert(key_data{key, data});
         }
     }