diff --git a/interface/wx/button.h b/interface/wx/button.h
index ae001f3fcc..9be66609d8 100644
--- a/interface/wx/button.h
+++ b/interface/wx/button.h
@@ -72,8 +72,13 @@
     @style{wxBU_BOTTOM}
         Aligns the label to the bottom of the button. Windows and GTK+ only.
     @style{wxBU_EXACTFIT}
-        Creates the button as small as possible instead of making it of the
-        standard size (which is the default behaviour ).
+        By default, all buttons are made of at least the standard button size,
+        even if their contents is small enough to fit into a smaller size. This
+        is done for consistency as most platforms use buttons of the same size
+        in the native dialogs, but can be overridden by specifying this flag.
+        If it is given, the button will be made just big enough for its
+        contents. Notice that under MSW the button will still have at least the
+        standard height, even with this style, if it has a non-empty label.
     @style{wxBU_NOTEXT}
         Disables the display of the text label in the button even if it has one
         or its id is one of the standard stock ids with an associated label:
diff --git a/src/msw/anybutton.cpp b/src/msw/anybutton.cpp
index 2bf1b41f4c..b8fc1ad197 100644
--- a/src/msw/anybutton.cpp
+++ b/src/msw/anybutton.cpp
@@ -429,27 +429,31 @@ wxSize wxMSWButton::IncreaseToStdSizeAndCache(wxControl *btn, const wxSize& size
 {
     wxSize sizeBtn(size);
 
-    // All buttons have at least the standard height and, unless the user
-    // explicitly wants them to be as small as possible and used wxBU_EXACTFIT
-    // style to indicate this, of at least the standard width too.
-    //
-    // Notice that we really want to make all buttons equally high, otherwise
-    // they look ugly and the existing code using wxBU_EXACTFIT only uses it to
-    // control width and not height.
-
     // The 50x14 button size is documented in the "Recommended sizing and
     // spacing" section of MSDN layout article.
     //
     // Note that we intentionally don't use GetDefaultSize() here, because
     // it's inexact -- dialog units depend on this dialog's font.
     const wxSize sizeDef = btn->ConvertDialogToPixels(wxSize(50, 14));
-    if ( !btn->HasFlag(wxBU_EXACTFIT) )
+
+    // All buttons should have at least the standard size, unless the user
+    // explicitly wants them to be as small as possible and used wxBU_EXACTFIT
+    // style to indicate this.
+    const bool incToStdSize = !btn->HasFlag(wxBU_EXACTFIT);
+    if ( incToStdSize )
     {
         if ( sizeBtn.x < sizeDef.x )
             sizeBtn.x = sizeDef.x;
     }
-    if ( sizeBtn.y < sizeDef.y )
-        sizeBtn.y = sizeDef.y;
+
+    // Notice that we really want to make all buttons with text label equally
+    // high, otherwise they look ugly and the existing code using wxBU_EXACTFIT
+    // only uses it to control width and not height.
+    if ( incToStdSize || !btn->GetLabel().empty() )
+    {
+        if ( sizeBtn.y < sizeDef.y )
+            sizeBtn.y = sizeDef.y;
+    }
 
     btn->CacheBestSize(sizeBtn);