diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp
index 688e8123a..dd75f1207 100644
--- a/src/qt/paymentserver.cpp
+++ b/src/qt/paymentserver.cpp
@@ -55,8 +55,6 @@ const char* BIP70_MESSAGE_PAYMENTREQUEST = "PaymentRequest";
 const char* BIP71_MIMETYPE_PAYMENT = "application/bitcoin-payment";
 const char* BIP71_MIMETYPE_PAYMENTACK = "application/bitcoin-paymentack";
 const char* BIP71_MIMETYPE_PAYMENTREQUEST = "application/bitcoin-paymentrequest";
-// BIP70 max payment request size in bytes (DoS protection)
-const qint64 BIP70_MAX_PAYMENTREQUEST_SIZE = 50000;
 
 struct X509StoreDeleter {
       void operator()(X509_STORE* b) {
diff --git a/src/qt/paymentserver.h b/src/qt/paymentserver.h
index 9d46280a3..7c6d4507f 100644
--- a/src/qt/paymentserver.h
+++ b/src/qt/paymentserver.h
@@ -53,7 +53,7 @@ class QUrl;
 QT_END_NAMESPACE
 
 // BIP70 max payment request size in bytes (DoS protection)
-extern const qint64 BIP70_MAX_PAYMENTREQUEST_SIZE;
+static const qint64 BIP70_MAX_PAYMENTREQUEST_SIZE = 50000;
 
 class PaymentServer : public QObject
 {