diff --git a/src/gui/image_slice_window.cpp b/src/gui/image_slice_window.cpp
index 1d4e4353..2b3bb166 100644
--- a/src/gui/image_slice_window.cpp
+++ b/src/gui/image_slice_window.cpp
@@ -421,12 +421,9 @@ ImageSlicePreview::ImageSlicePreview(Window* parent, int id, ImageSlice& slice,
 void ImageSlicePreview::update() {
   bitmap = wxNullBitmap;
   Refresh(false);
-}
-
-wxSize ImageSlicePreview::DoGetBestSize() const {
-  // We know the client size we want, calculate the size that goes with that
-  wxSize ws = GetSize(), cs = GetClientSize();
+}
 
+wxSize ImageSlicePreview::getBestSliceSize() const {
   float target_ratio = ((float)slice.target_size.GetWidth()) / ((float)slice.target_size.GetHeight());
   if (target_ratio > 1.0) {
     return wxSize(500, 500 / target_ratio);
@@ -435,6 +432,14 @@ wxSize ImageSlicePreview::DoGetBestSize() const {
   }
 }
 
+wxSize ImageSlicePreview::DoGetBestSize() const {
+  // We know the client size we want, calculate the size that goes with that
+  // This helps with applying margins and other spacing necessities.
+  wxSize ws = GetSize(), cs = GetClientSize();
+
+  return getBestSliceSize() + ws - cs;
+}
+
 void ImageSlicePreview::onPaint(wxPaintEvent&) {
   wxPaintDC dc(this);
   draw(dc);
@@ -459,7 +464,7 @@ void ImageSlicePreview::draw(DC& dc) {
     }
 
     // Rescale the bitmap based on the available size.
-    auto available_size = DoGetBestSize();
+    auto available_size = getBestSliceSize();
     bitmap = wxBitmap(bitmap.ConvertToImage().Scale(available_size.GetWidth(), available_size.GetHeight()));
   }
   if (bitmap.Ok()) {
diff --git a/src/gui/image_slice_window.hpp b/src/gui/image_slice_window.hpp
index 2a8dcf1b..4b26fb28 100644
--- a/src/gui/image_slice_window.hpp
+++ b/src/gui/image_slice_window.hpp
@@ -137,7 +137,8 @@ private:
   
   // --------------------------------------------------- : Events
   DECLARE_EVENT_TABLE();
-  
+  
+  wxSize getBestSliceSize() const;
   wxSize DoGetBestSize() const override;
   
   void onLeftDown(wxMouseEvent&);