diff --git a/Applications/Calculator/CalculatorWidget.cpp b/Applications/Calculator/CalculatorWidget.cpp
index a51251dc48..bc76b576cf 100644
--- a/Applications/Calculator/CalculatorWidget.cpp
+++ b/Applications/Calculator/CalculatorWidget.cpp
@@ -29,6 +29,7 @@
 #include <LibGUI/Button.h>
 #include <LibGUI/Label.h>
 #include <LibGUI/TextBox.h>
+#include <LibGfx/Font.h>
 
 CalculatorWidget::CalculatorWidget()
 {
@@ -37,6 +38,7 @@ CalculatorWidget::CalculatorWidget()
     m_entry = add<GUI::TextBox>();
     m_entry->set_relative_rect(5, 5, 244, 26);
     m_entry->set_text_alignment(Gfx::TextAlignment::CenterRight);
+    m_entry->set_font(Gfx::Font::default_fixed_width_font());
 
     m_label = add<GUI::Label>();
     m_label->set_relative_rect(12, 42, 27, 27);