diff --git a/src/wallet/fees.h b/src/wallet/fees.h
--- a/src/wallet/fees.h
+++ b/src/wallet/fees.h
@@ -18,12 +18,6 @@
  */
 Amount GetMinimumFee(unsigned int nTxBytes, const CTxMemPool &pool);
 
-/**
- * Estimate the minimum fee considering required fee and targetFee
- */
-Amount GetMinimumFee(unsigned int nTxBytes, const CTxMemPool &pool,
-                     Amount targetFee);
-
 /**
  * Estimate the minimum fee considering overriden fee rate from coin control
  */
diff --git a/src/wallet/fees.cpp b/src/wallet/fees.cpp
--- a/src/wallet/fees.cpp
+++ b/src/wallet/fees.cpp
@@ -13,8 +13,8 @@
 #include <wallet/coincontrol.h>
 #include <wallet/wallet.h>
 
-Amount GetMinimumFee(unsigned int nTxBytes, const CTxMemPool &pool,
-                     Amount targetFee) {
+static Amount GetMinimumFee(unsigned int nTxBytes, const CTxMemPool &pool,
+                            Amount targetFee) {
     Amount nFeeNeeded = targetFee;
     if (nFeeNeeded == Amount::zero()) {
         nFeeNeeded = pool.estimateFee().GetFeeCeiling(nTxBytes);