diff --git a/src/table/palette_convert.h b/src/table/palette_convert.h
--- a/src/table/palette_convert.h
+++ b/src/table/palette_convert.h
@@ -10,7 +10,7 @@
 /** @file palette_convert.h Translation tables from one GRF to another GRF. */
 
 /** Converting from the Windows palette to the DOS palette */
-static const byte _palmap_w2d[] = {
+extern const byte _palmap_w2d[] = {
 	  0,   1,   2,   3,   4,   5,   6,   7, //   0..7
 	  8,   9,  10,  11,  12,  13,  14,  15, //   8..15
 	 16,  17,  18,  19,  20,  21,  22,  23, //  16..23
@@ -46,7 +46,7 @@ static const byte _palmap_w2d[] = {
 };
 
 /** Converting from the DOS palette to the Windows palette */
-extern const byte _palmap_d2w[] = {
+static const byte _palmap_d2w[] = {
 	  0, 215, 216, 136,  88, 106,  32,  33, //   0..7
 	 40, 245,  10,  11,  12,  13,  14,  15, //   8..15
 	 16,  17,  18,  19,  20,  21,  22,  23, //  16..23