diff --git a/include/wx/generic/colrdlgg.h b/include/wx/generic/colrdlgg.h
index 91eb2309e4..9de93ab7ff 100644
--- a/include/wx/generic/colrdlgg.h
+++ b/include/wx/generic/colrdlgg.h
@@ -75,7 +75,7 @@ protected:
     wxRect m_singleCustomColourRect;
 
     // Size of each colour rectangle
-    wxPoint m_smallRectangleSize;
+    wxSize m_smallRectangleSize;
 
     // Grid spacing (between rectangles)
     int m_gridSpacing;
diff --git a/src/generic/colrdlgg.cpp b/src/generic/colrdlgg.cpp
index fe2c5615db..f2a1ab96fe 100644
--- a/src/generic/colrdlgg.cpp
+++ b/src/generic/colrdlgg.cpp
@@ -207,8 +207,7 @@ void wxGenericColourDialog::CalculateMeasurements()
     // For single customizable colour
     const wxSize customRectangleSize(40, 40);
 
-    m_smallRectangleSize.x = 18;
-    m_smallRectangleSize.y = 14;
+    m_smallRectangleSize.Set(18, 14);
 
     m_gridSpacing = 6;
     m_sectionSpacing = 15;