diff --git a/src/primitives/transaction.h b/src/primitives/transaction.h
--- a/src/primitives/transaction.h
+++ b/src/primitives/transaction.h
@@ -334,6 +334,8 @@
 
     PrecomputedTransactionData(const PrecomputedTransactionData &txdata) =
         default;
+    PrecomputedTransactionData &
+    operator=(const PrecomputedTransactionData &txdata) = default;
 
     template <class T> explicit PrecomputedTransactionData(const T &tx);
 };
diff --git a/src/psbt.h b/src/psbt.h
--- a/src/psbt.h
+++ b/src/psbt.h
@@ -359,9 +359,6 @@
      */
     bool GetInputUTXO(CTxOut &utxo, int input_index) const;
 
-    PartiallySignedTransaction &
-    operator=(const PartiallySignedTransaction &other) = default;
-
     template <typename Stream> inline void Serialize(Stream &s) const {
         // magic bytes
         s << PSBT_MAGIC_BYTES;
diff --git a/src/script/scriptcache.h b/src/script/scriptcache.h
--- a/src/script/scriptcache.h
+++ b/src/script/scriptcache.h
@@ -33,6 +33,8 @@
     ScriptCacheKey(const ScriptCacheKey &rhs) = default;
     ScriptCacheKey(const CTransaction &tx, uint32_t flags);
 
+    ScriptCacheKey &operator=(const ScriptCacheKey &rhs) = default;
+
     bool operator==(const ScriptCacheKey &rhs) const {
         return rhs.data == data;
     }
diff --git a/src/test/cuckoocache_tests.cpp b/src/test/cuckoocache_tests.cpp
--- a/src/test/cuckoocache_tests.cpp
+++ b/src/test/cuckoocache_tests.cpp
@@ -44,6 +44,8 @@
             std::copy(k.begin() + 4, k.end(), data.begin());
         }
 
+        KeyType &operator=(const KeyType &rhs) = default;
+
         bool operator==(const KeyType &rhs) const { return rhs.data == data; }
     };
 
@@ -60,6 +62,8 @@
     TestMapElement(const KeyType &keyIn, uint32_t valueIn)
         : key(keyIn), value(valueIn) {}
 
+    TestMapElement &operator=(const TestMapElement &e) = default;
+
     const KeyType &getKey() const { return key; }
     uint32_t getValue() const { return value; }