diff --git a/src/index/blockfilterindex.h b/src/index/blockfilterindex.h
--- a/src/index/blockfilterindex.h
+++ b/src/index/blockfilterindex.h
@@ -11,6 +11,8 @@
 #include <index/base.h>
 #include <util/hasher.h>
 
+static const char *const DEFAULT_BLOCKFILTERINDEX = "0";
+
 /** Interval between compact filter checkpoints. See BIP 157. */
 static constexpr int CFCHECKPT_INTERVAL = 1000;
 
diff --git a/src/index/coinstatsindex.h b/src/index/coinstatsindex.h
--- a/src/index/coinstatsindex.h
+++ b/src/index/coinstatsindex.h
@@ -13,6 +13,8 @@
 
 struct Amount;
 
+static constexpr bool DEFAULT_COINSTATSINDEX{false};
+
 /**
  * CoinStatsIndex maintains statistics on the UTXO set.
  */
diff --git a/src/index/txindex.h b/src/index/txindex.h
--- a/src/index/txindex.h
+++ b/src/index/txindex.h
@@ -12,6 +12,8 @@
 struct BlockHash;
 struct TxId;
 
+static constexpr bool DEFAULT_TXINDEX{false};
+
 /**
  * TxIndex is used to look up transactions included in the blockchain by ID.
  * The index is written to a LevelDB database and records the filesystem
diff --git a/src/node/caches.cpp b/src/node/caches.cpp
--- a/src/node/caches.cpp
+++ b/src/node/caches.cpp
@@ -4,9 +4,9 @@
 
 #include <node/caches.h>
 
+#include <index/txindex.h>
 #include <txdb.h>
 #include <util/system.h>
-#include <validation.h>
 
 namespace node {
 CacheSizes CalculateCacheSizes(const ArgsManager &args, size_t n_indexes) {
diff --git a/src/validation.h b/src/validation.h
--- a/src/validation.h
+++ b/src/validation.h
@@ -83,9 +83,6 @@
 static const int DEFAULT_SCRIPTCHECK_THREADS = 0;
 static const int64_t DEFAULT_MAX_TIP_AGE = 24 * 60 * 60;
 static const bool DEFAULT_CHECKPOINTS_ENABLED = true;
-static const bool DEFAULT_TXINDEX = false;
-static constexpr bool DEFAULT_COINSTATSINDEX{false};
-static const char *const DEFAULT_BLOCKFILTERINDEX = "0";
 
 static const bool DEFAULT_PEERBLOOMFILTERS = true;