diff --git a/src/net_processing.h b/src/net_processing.h
--- a/src/net_processing.h
+++ b/src/net_processing.h
@@ -14,6 +14,7 @@
 extern RecursiveMutex cs_main;
 extern RecursiveMutex g_cs_orphans;
 
+class BlockValidationState;
 class CBlockHeader;
 class CTxMemPool;
 class ChainstateManager;
@@ -124,6 +125,23 @@
     void ReattemptInitialBroadcast(CScheduler &scheduler) const;
 
 private:
+    /**
+     * Potentially mark a node discouraged based on the contents of a
+     * BlockValidationState object
+     *
+     * @param[in] via_compact_block this bool is passed in because
+     * net_processing should punish peers differently depending on whether the
+     * data was provided in a compact block message or not. If the compact block
+     * had a valid header, but contained invalid txs, the peer should not be
+     * punished. See BIP 152.
+     *
+     * @return Returns true if the peer was punished (probably disconnected)
+     */
+    bool MaybePunishNodeForBlock(NodeId nodeid,
+                                 const BlockValidationState &state,
+                                 bool via_compact_block,
+                                 const std::string &message = "");
+
     /**
      * Maybe disconnect a peer and discourage future connections from its
      * address.
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -1362,20 +1362,10 @@
     return state.GetResult() == TxValidationResult::TX_CONSENSUS;
 }
 
-/**
- * Potentially ban a node based on the contents of a BlockValidationState object
- *
- * @param[in] via_compact_block this bool is passed in because net_processing
- * should punish peers differently depending on whether the data was provided in
- * a compact block message or not. If the compact block had a valid header, but
- * contained invalid txs, the peer should not be punished. See BIP 152.
- *
- * @return Returns true if the peer was punished (probably disconnected)
- */
-static bool MaybePunishNodeForBlock(NodeId nodeid,
-                                    const BlockValidationState &state,
-                                    bool via_compact_block,
-                                    const std::string &message = "") {
+bool PeerManager::MaybePunishNodeForBlock(NodeId nodeid,
+                                          const BlockValidationState &state,
+                                          bool via_compact_block,
+                                          const std::string &message) {
     switch (state.GetResult()) {
         case BlockValidationResult::BLOCK_RESULT_UNSET:
             break;