diff --git a/src/feerate.h b/src/feerate.h
index e56882e8b9..ec2b249523 100644
--- a/src/feerate.h
+++ b/src/feerate.h
@@ -1,85 +1,97 @@
 // Copyright (c) 2009-2010 Satoshi Nakamoto
 // Copyright (c) 2009-2016 The Bitcoin Core developers
 // Copyright (c) 2017-2018 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_FEERATE_H
 #define BITCOIN_FEERATE_H
 
 #include "amount.h"
 #include "serialize.h"
 
 #include <cstdlib>
 #include <ostream>
 #include <string>
 #include <type_traits>
 
 /**
  * Fee rate in satoshis per kilobyte: Amount / kB
  */
 class CFeeRate {
 private:
     // unit is satoshis-per-1,000-bytes
     Amount nSatoshisPerK;
 
 public:
     /**
      * Fee rate of 0 satoshis per kB.
      */
-    CFeeRate() : nSatoshisPerK() {}
-    explicit CFeeRate(const Amount _nSatoshisPerK)
+    constexpr CFeeRate() : nSatoshisPerK() {}
+    explicit constexpr CFeeRate(const Amount _nSatoshisPerK)
         : nSatoshisPerK(_nSatoshisPerK) {}
 
     /**
      * Constructor for a fee rate in satoshis per kB. The size in bytes must not
      * exceed (2^63 - 1)
      */
     CFeeRate(const Amount nFeePaid, size_t nBytes);
-    CFeeRate(const CFeeRate &other) { nSatoshisPerK = other.nSatoshisPerK; }
+    constexpr CFeeRate(const CFeeRate &other)
+        : nSatoshisPerK(other.nSatoshisPerK) {}
 
     /**
      * Return the fee in satoshis for the given size in bytes.
      */
     Amount GetFee(size_t nBytes) const;
 
     /**
      * Return the ceiling of a fee calculation in satoshis for the given size in
      * bytes.
      */
     Amount GetFeeCeiling(size_t nBytes) const;
 
     /**
      * Return the fee in satoshis for a size of 1000 bytes
      */
     Amount GetFeePerK() const { return GetFee(1000); }
+
+    /**
+     * Equality
+     */
+    friend constexpr bool operator==(const CFeeRate a, const CFeeRate b) {
+        return a.nSatoshisPerK == b.nSatoshisPerK;
+    }
+    friend constexpr bool operator!=(const CFeeRate a, const CFeeRate b) {
+        return !(a == b);
+    }
+
+    /**
+     * Comparison
+     */
     friend bool operator<(const CFeeRate &a, const CFeeRate &b) {
         return a.nSatoshisPerK < b.nSatoshisPerK;
     }
     friend bool operator>(const CFeeRate &a, const CFeeRate &b) {
         return a.nSatoshisPerK > b.nSatoshisPerK;
     }
-    friend bool operator==(const CFeeRate &a, const CFeeRate &b) {
-        return a.nSatoshisPerK == b.nSatoshisPerK;
-    }
     friend bool operator<=(const CFeeRate &a, const CFeeRate &b) {
         return a.nSatoshisPerK <= b.nSatoshisPerK;
     }
     friend bool operator>=(const CFeeRate &a, const CFeeRate &b) {
         return a.nSatoshisPerK >= b.nSatoshisPerK;
     }
     CFeeRate &operator+=(const CFeeRate &a) {
         nSatoshisPerK += a.nSatoshisPerK;
         return *this;
     }
     std::string ToString() const;
 
     ADD_SERIALIZE_METHODS;
 
     template <typename Stream, typename Operation>
     inline void SerializationOp(Stream &s, Operation ser_action) {
         READWRITE(nSatoshisPerK);
     }
 };
 
 #endif //  BITCOIN_FEERATE_H