diff --git a/panels/background/background.ui b/panels/background/background.ui
index fdb020ff0..bf85374f5 100644
--- a/panels/background/background.ui
+++ b/panels/background/background.ui
@@ -67,7 +67,9 @@
                 <property name="column_spacing">0</property>
                 <property name="margin">0</property>
                 <child>
-                  <object class="GtkCellRendererPixbuf" id="pixbuf-renderer"/>
+                  <object class="GtkCellRendererPixbuf" id="pixbuf-renderer">
+                    <property name="stock_size">6</property>
+                  </object>
                   <attributes>
                     <attribute name="gicon">0</attribute>
                   </attributes>
diff --git a/panels/background/bg-source.h b/panels/background/bg-source.h
index d42254429..b73265fef 100644
--- a/panels/background/bg-source.h
+++ b/panels/background/bg-source.h
@@ -26,8 +26,8 @@
 
 G_BEGIN_DECLS
 
-#define THUMBNAIL_WIDTH 47
-#define THUMBNAIL_HEIGHT 47
+#define THUMBNAIL_WIDTH 48
+#define THUMBNAIL_HEIGHT 48
 
 #define BG_TYPE_SOURCE bg_source_get_type()