diff --git a/src/Makefile.am b/src/Makefile.am
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -169,6 +169,7 @@
   noui.h \
   outputtype.h \
   policy/fees.h \
+  policy/mempool.h \
   policy/policy.h \
   pow.h \
   protocol.h \
diff --git a/src/init.cpp b/src/init.cpp
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -29,6 +29,7 @@
 #include <net.h>
 #include <net_processing.h>
 #include <netbase.h>
+#include <policy/mempool.h>
 #include <policy/policy.h>
 #include <rpc/blockchain.h>
 #include <rpc/register.h>
diff --git a/src/policy/mempool.h b/src/policy/mempool.h
new file mode 100644
--- /dev/null
+++ b/src/policy/mempool.h
@@ -0,0 +1,22 @@
+// Copyright (c) 2020 The Bitcoin developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+#ifndef BITCOIN_POLICY_MEMPOOL_H
+#define BITCOIN_POLICY_MEMPOOL_H
+
+/** Default for -limitancestorcount, max number of in-mempool ancestors */
+static const unsigned int DEFAULT_ANCESTOR_LIMIT = 25;
+/**
+ * Default for -limitancestorsize, maximum kilobytes of tx + all in-mempool
+ * ancestors.
+ */
+static const unsigned int DEFAULT_ANCESTOR_SIZE_LIMIT = 101;
+/** Default for -limitdescendantcount, max number of in-mempool descendants */
+static const unsigned int DEFAULT_DESCENDANT_LIMIT = 25;
+/**
+ * Default for -limitdescendantsize, maximum kilobytes of in-mempool
+ * descendants.
+ */
+static const unsigned int DEFAULT_DESCENDANT_SIZE_LIMIT = 101;
+
+#endif // BITCOIN_POLICY_MEMPOOL_H
diff --git a/src/validation.h b/src/validation.h
--- a/src/validation.h
+++ b/src/validation.h
@@ -77,20 +77,6 @@
  * -maxtxfee will warn if called with a higher fee than this amount (in satoshis
  */
 static const Amount HIGH_MAX_TX_FEE(100 * HIGH_TX_FEE_PER_KB);
-/** Default for -limitancestorcount, max number of in-mempool ancestors */
-static const unsigned int DEFAULT_ANCESTOR_LIMIT = 25;
-/**
- * Default for -limitancestorsize, maximum kilobytes of tx + all in-mempool
- * ancestors.
- */
-static const unsigned int DEFAULT_ANCESTOR_SIZE_LIMIT = 101;
-/** Default for -limitdescendantcount, max number of in-mempool descendants */
-static const unsigned int DEFAULT_DESCENDANT_LIMIT = 25;
-/**
- * Default for -limitdescendantsize, maximum kilobytes of in-mempool
- * descendants.
- */
-static const unsigned int DEFAULT_DESCENDANT_SIZE_LIMIT = 101;
 /**
  * Default for -mempoolexpiry, expiration time for mempool transactions in
  * hours.
diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -23,6 +23,7 @@
 #include <hash.h>
 #include <index/txindex.h>
 #include <policy/fees.h>
+#include <policy/mempool.h>
 #include <policy/policy.h>
 #include <pow.h>
 #include <primitives/block.h>
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -16,6 +16,7 @@
 #include <key_io.h>
 #include <keystore.h>
 #include <net.h>
+#include <policy/mempool.h>
 #include <policy/policy.h>
 #include <primitives/block.h>
 #include <primitives/transaction.h>