diff --git a/src/validation.h b/src/validation.h
--- a/src/validation.h
+++ b/src/validation.h
@@ -80,17 +80,8 @@
 static const int MAX_SCRIPTCHECK_THREADS = 15;
 /** -par default (number of script-checking threads, 0 = auto) */
 static const int DEFAULT_SCRIPTCHECK_THREADS = 0;
-/** Time to wait (in seconds) between writing blocks/block index to disk. */
-static const unsigned int DATABASE_WRITE_INTERVAL = 60 * 60;
-/** Time to wait (in seconds) between flushing chainstate to disk. */
-static const unsigned int DATABASE_FLUSH_INTERVAL = 24 * 60 * 60;
 
 static const int64_t DEFAULT_MAX_TIP_AGE = 24 * 60 * 60;
-/**
- * Maximum age of our tip in seconds for us to be considered current for fee
- * estimation.
- */
-static const int64_t MAX_FEE_ESTIMATION_TIP_AGE = 3 * 60 * 60;
 
 static const bool DEFAULT_CHECKPOINTS_ENABLED = true;
 static const bool DEFAULT_TXINDEX = false;
diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -62,6 +62,11 @@
 #define MICRO 0.000001
 #define MILLI 0.001
 
+/** Time to wait (in seconds) between writing blocks/block index to disk. */
+static const unsigned int DATABASE_WRITE_INTERVAL = 60 * 60;
+/** Time to wait (in seconds) between flushing chainstate to disk. */
+static const unsigned int DATABASE_FLUSH_INTERVAL = 24 * 60 * 60;
+
 ChainstateManager g_chainman;
 
 CChainState &ChainstateActive() {