diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -515,7 +515,14 @@
      *  0  : in memory pool, waiting to be included in a block
      * >=1 : this many blocks deep in the main chain
      */
-    int GetDepthInMainChain(interfaces::Chain::Lock &locked_chain) const;
+    // TODO: Remove "NO_THREAD_SAFETY_ANALYSIS" and replace it with the correct
+    // annotation "EXCLUSIVE_LOCKS_REQUIRED(pwallet->cs_wallet)". The annotation
+    // "NO_THREAD_SAFETY_ANALYSIS" was temporarily added to avoid having to
+    // resolve the issue of member access into incomplete type CWallet. Note
+    // that we still have the runtime check "AssertLockHeld(pwallet->cs_wallet)"
+    // in place.
+    int GetDepthInMainChain(interfaces::Chain::Lock &locked_chain) const
+        NO_THREAD_SAFETY_ANALYSIS;
     bool IsInMainChain(interfaces::Chain::Lock &locked_chain) const {
         return GetDepthInMainChain(locked_chain) > 0;
     }
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -4386,11 +4386,13 @@
 
 int CWalletTx::GetDepthInMainChain(
     interfaces::Chain::Lock &locked_chain) const {
+    assert(pwallet != nullptr);
+    AssertLockHeld(pwallet->cs_wallet);
     if (isUnconfirmed() || isAbandoned()) {
         return 0;
     }
 
-    return locked_chain.getBlockDepth(m_confirm.hashBlock) *
+    return (pwallet->GetLastBlockHeight() - m_confirm.block_height + 1) *
            (isConflicted() ? -1 : 1);
 }