diff --git a/data/gui/default/macros/filler.cfg b/data/gui/default/macros/filler.cfg
new file mode 100644
index 00000000000..0a031acba34
--- /dev/null
+++ b/data/gui/default/macros/filler.cfg
@@ -0,0 +1,11 @@
+#textdomain wesnoth-lib
+# Defines the default spacer used to fill a grid cell.
+# This is needed since empty cells aren't allowed.
+
+#define GUI_FILLER
+	[column]
+		[spacer]
+		[/spacer]
+	[/column]
+#enddef
+