diff --git a/src/saveload/signs_sl.cpp b/src/saveload/signs_sl.cpp
--- a/src/saveload/signs_sl.cpp
+++ b/src/saveload/signs_sl.cpp
@@ -19,15 +19,15 @@
 
 /** Description of a sign within the savegame. */
 static const SaveLoad _sign_desc[] = {
-	SLE_CONDVAR(Sign, name,  SLE_NAME,                   0, 84),
-	SLE_CONDSTR(Sign, name,  SLE_STR | SLF_ALLOW_CONTROL, 0, 84, SL_MAX_VERSION),
-	SLE_CONDVAR(Sign, x,     SLE_FILE_I16 | SLE_VAR_I32, 0, 5),
-	SLE_CONDVAR(Sign, y,     SLE_FILE_I16 | SLE_VAR_I32, 0, 5),
-	SLE_CONDVAR(Sign, x,     SLE_INT32,                  5, SL_MAX_VERSION),
-	SLE_CONDVAR(Sign, y,     SLE_INT32,                  5, SL_MAX_VERSION),
-	SLE_CONDVAR(Sign, owner, SLE_UINT8,                  6, SL_MAX_VERSION),
-	SLE_CONDVAR(Sign, z,     SLE_FILE_U8  | SLE_VAR_I32, 0, 164),
-	SLE_CONDVAR(Sign, z,     SLE_INT32,                164, SL_MAX_VERSION),
+	SLE_CONDVAR(Sign, name,  SLE_NAME,                   SL_MIN_VERSION, SLV_84),
+	SLE_CONDSTR(Sign, name,  SLE_STR | SLF_ALLOW_CONTROL, 0, SLV_84, SL_MAX_VERSION),
+	SLE_CONDVAR(Sign, x,     SLE_FILE_I16 | SLE_VAR_I32, SL_MIN_VERSION, SLV_5),
+	SLE_CONDVAR(Sign, y,     SLE_FILE_I16 | SLE_VAR_I32, SL_MIN_VERSION, SLV_5),
+	SLE_CONDVAR(Sign, x,     SLE_INT32,                  SLV_5, SL_MAX_VERSION),
+	SLE_CONDVAR(Sign, y,     SLE_INT32,                  SLV_5, SL_MAX_VERSION),
+	SLE_CONDVAR(Sign, owner, SLE_UINT8,                  SLV_6, SL_MAX_VERSION),
+	SLE_CONDVAR(Sign, z,     SLE_FILE_U8  | SLE_VAR_I32, SL_MIN_VERSION, SLV_164),
+	SLE_CONDVAR(Sign, z,     SLE_INT32,                SLV_164, SL_MAX_VERSION),
 	SLE_END()
 };
 
@@ -55,12 +55,12 @@ static void Load_SIGN()
 		 *  - we can't use IsValidCompany() now, so this is fixed in AfterLoadGame()
 		 * All signs that were saved are valid (including those with just 'Sign' and INVALID_OWNER).
 		 *  - so set owner to OWNER_NONE if needed (signs from pre-version 6.1 would be lost) */
-		if (IsSavegameVersionBefore(6, 1) || (IsSavegameVersionBefore(83) && si->owner == INVALID_OWNER)) {
+		if (IsSavegameVersionBefore(SLV_6, 1) || (IsSavegameVersionBefore(SLV_83) && si->owner == INVALID_OWNER)) {
 			si->owner = OWNER_NONE;
 		}
 
 		/* Signs placed in scenario editor shall now be OWNER_DEITY */
-		if (IsSavegameVersionBefore(171) && si->owner == OWNER_NONE && _file_to_saveload.abstract_ftype == FT_SCENARIO) {
+		if (IsSavegameVersionBefore(SLV_171) && si->owner == OWNER_NONE && _file_to_saveload.abstract_ftype == FT_SCENARIO) {
 			si->owner = OWNER_DEITY;
 		}
 	}