diff --git a/src/smallmap_gui.cpp b/src/smallmap_gui.cpp
index 243d3c911a..814c1066ac 100644
--- a/src/smallmap_gui.cpp
+++ b/src/smallmap_gui.cpp
@@ -792,7 +792,7 @@ static void SmallMapWindowProc(Window *w, WindowEvent *e)
 {
 	switch (e->event) {
 		case WE_PAINT: {
-			LegendAndColour *tbl;
+			const LegendAndColour *tbl;
 			int x, y, y_org;
 			DrawPixelInfo new_dpi;