--- a/src/newgrf_fsmports.cpp	Sun Aug 05 23:43:56 2007 +0000
+++ b/src/newgrf_fsmports.cpp	Mon Aug 06 00:44:01 2007 +0000
@@ -165,7 +165,7 @@
  * @param fsport The index with the class.
  * @return The fsmspec.
  */
-const FSMportsSpec *GetCustomFSMportsSpec(FSMportsClassID sclass, uint fsmport)
+FSMportsSpec *GetCustomFSMportsSpec(FSMportsClassID sclass, uint fsmport)
 {
 	assert(sclass < FSMPORTS_CLASS_MAX);
 	if (fsmport < fsmports_classes[sclass].FSMports)