diff --git a/Source/GUI/MemViewer/MemViewer.cpp b/Source/GUI/MemViewer/MemViewer.cpp
index b4a615e..47d0b9c 100644
--- a/Source/GUI/MemViewer/MemViewer.cpp
+++ b/Source/GUI/MemViewer/MemViewer.cpp
@@ -49,7 +49,7 @@ MemViewer::~MemViewer()
 
 void MemViewer::initialise()
 {
-  updateFontSize(m_memoryFontSize);
+  updateFontSize();
   m_curosrRect = new QRect();
   m_updatedRawMemoryData = new char[m_numCells];
   m_lastRawMemoryData = new char[m_numCells];
@@ -356,9 +356,14 @@ void MemViewer::wheelEvent(QWheelEvent* event)
   if (event->modifiers().testFlag(Qt::ControlModifier))
   {
     if (event->angleDelta().y() < 0 && m_memoryFontSize > 5)
-      updateFontSize(m_memoryFontSize - 1);
+    {
+      m_memoryFontSize -= 1;
+    }
     else if (event->angleDelta().y() > 0)
-      updateFontSize(m_memoryFontSize + 1);
+    {
+      m_memoryFontSize += 1;
+    }
+    updateFontSize();
 
     viewport()->update();
   }
@@ -368,9 +373,12 @@ void MemViewer::wheelEvent(QWheelEvent* event)
   }
 }
 
-void MemViewer::updateFontSize(int newSize)
+void MemViewer::updateFontSize()
 {
-  m_memoryFontSize = newSize;
+  if (m_memoryFontSize == -1)
+  {
+    m_memoryFontSize = static_cast<int>(font().pointSize() * 1.5);
+  }
 
   QFont fixedFont = QFontDatabase::systemFont(QFontDatabase::FixedFont);
   fixedFont.setPointSize(m_memoryFontSize);
diff --git a/Source/GUI/MemViewer/MemViewer.h b/Source/GUI/MemViewer/MemViewer.h
index bdfcae2..eff1f7b 100644
--- a/Source/GUI/MemViewer/MemViewer.h
+++ b/Source/GUI/MemViewer/MemViewer.h
@@ -67,7 +67,7 @@ class MemViewer : public QAbstractScrollArea
 
   void initialise();
 
-  void updateFontSize(int newSize);
+  void updateFontSize();
   bytePosFromMouse mousePosToBytePos(QPoint pos);
   void scrollToSelection();
   void copySelection(Common::MemType type) const;
@@ -93,7 +93,7 @@ class MemViewer : public QAbstractScrollArea
   const int m_numRows = 16;
   const int m_numColumns = 16;  // Should be a multiple of 16, or the header doesn't make much sense
   const int m_numCells = m_numRows * m_numColumns;
-  int m_memoryFontSize = 15;
+  int m_memoryFontSize = -1;
   int m_StartBytesSelectionPosX = 0;
   int m_StartBytesSelectionPosY = 0;
   int m_EndBytesSelectionPosX = 0;