diff --git a/src/qt/bitcoinamountfield.cpp b/src/qt/bitcoinamountfield.cpp
index d19b0ebfa..78bfc0465 100644
--- a/src/qt/bitcoinamountfield.cpp
+++ b/src/qt/bitcoinamountfield.cpp
@@ -99,7 +99,7 @@ class AmountSpinBox: public QAbstractSpinBox
 
             const QFontMetrics fm(fontMetrics());
             int h = lineEdit()->minimumSizeHint().height();
-            int w = fm.width(BitcoinUnits::format(BitcoinUnits::BUT, BitcoinUnits::maxMoney(), false, BitcoinUnits::separatorAlways));
+            int w = fm.width(BitcoinUnits::format(BitcoinUnits::BUTK, BitcoinUnits::maxMoney(), false, BitcoinUnits::separatorAlways));
             w += 2; // cursor blinking space
 
             QStyleOptionSpinBox opt;