diff --git a/src/qt/guiconstants.h b/src/qt/guiconstants.h
index 59f49625..79856d47 100644
--- a/src/qt/guiconstants.h
+++ b/src/qt/guiconstants.h
@@ -4,8 +4,12 @@
 /* milliseconds between model updates */
 static const int MODEL_UPDATE_DELAY = 500;
 
-/* size of cache */
-static const unsigned int WALLET_CACHE_SIZE = 100;
+/* Invalid field background style */
+#define STYLE_INVALID "background:#FF8080"
 
+/* Transaction list -- unconfirmed transaction */
+#define COLOR_UNCONFIRMED QColor(128, 128, 128)
+/* Transaction list -- negative amount */
+#define COLOR_NEGATIVE QColor(128, 128, 128)
 
 #endif // GUICONSTANTS_H
diff --git a/src/qt/qvalidatedlineedit.cpp b/src/qt/qvalidatedlineedit.cpp
index 2430cc9f..8ca230c9 100644
--- a/src/qt/qvalidatedlineedit.cpp
+++ b/src/qt/qvalidatedlineedit.cpp
@@ -1,5 +1,7 @@
 #include "qvalidatedlineedit.h"
 
+#include "guiconstants.h"
+
 QValidatedLineEdit::QValidatedLineEdit(QWidget *parent) :
     QLineEdit(parent), valid(true)
 {
@@ -19,7 +21,7 @@ void QValidatedLineEdit::setValid(bool valid)
     }
     else
     {
-        setStyleSheet("background:#FF8080");
+        setStyleSheet(STYLE_INVALID);
     }
     this->valid = valid;
 }
diff --git a/src/qt/transactiontablemodel.cpp b/src/qt/transactiontablemodel.cpp
index 17622e07..7062ceec 100644
--- a/src/qt/transactiontablemodel.cpp
+++ b/src/qt/transactiontablemodel.cpp
@@ -514,11 +514,11 @@ QVariant TransactionTableModel::data(const QModelIndex &index, int role) const
         /* Non-confirmed transactions are grey */
         if(!rec->status.confirmed)
         {
-            return QColor(128, 128, 128);
+            return COLOR_UNCONFIRMED;
         }
         if(index.column() == Amount && (rec->credit+rec->debit) < 0)
         {
-            return QColor(255, 0, 0);
+            return COLOR_NEGATIVE;
         }
     }
     else if (role == TypeRole)