diff --git a/network_gui.c b/network_gui.c
--- a/network_gui.c
+++ b/network_gui.c
@@ -68,24 +68,26 @@ static void NetworkTruncateString(char *
 	}
 }
 
+extern const char _openttd_revision[];
+
 static void NetworkGameWindowWndProc(Window *w, WindowEvent *e)
 {
 	switch(e->event) {
 	case WE_PAINT: {
-		if (_selected_item == NULL)
-			w->disabled_state = (1<<17) | (1<<18);
-		else if (!_selected_item->online)
-			w->disabled_state = (1<<17); // Server offline, join button disabled
-		else if (_selected_item->info.clients_on == _selected_item->info.clients_max)
-			w->disabled_state = (1<<17); // Server full, join button disabled
-#ifdef WITH_REV
-		else if (strncmp(_selected_item->info.server_revision, _openttd_revision, NETWORK_REVISION_LENGTH - 1) != 0) {
-			if (strncmp(_selected_item->info.server_revision, "norev000", sizeof(_selected_item->info.server_revision)) != 0)
-				w->disabled_state = (1<<17); // Revision mismatch, join button disabled
+		w->disabled_state = 0;
+
+		if (_selected_item == NULL) {
+			SETBIT(w->disabled_state, 17); SETBIT(w->disabled_state, 18);
+		} else if (!_selected_item->online) {
+			SETBIT(w->disabled_state, 17); // Server offline, join button disabled
+		} else if (_selected_item->info.clients_on == _selected_item->info.clients_max) {
+			SETBIT(w->disabled_state, 17); // Server full, join button disabled
+
+			// revisions don't match, check if server has no revision; then allow connection
+		} else if (strncmp(_selected_item->info.server_revision, _openttd_revision, NETWORK_REVISION_LENGTH - 1) != 0) {
+			if (strncmp(_selected_item->info.server_revision, NOREV_STRING, sizeof(_selected_item->info.server_revision)) != 0)
+				SETBIT(w->disabled_state, 17); // Revision mismatch, join button disabled
 		}
-#endif
-		else
-			w->disabled_state = 0;
 
 		SetDParam(0, 0x00);
 		SetDParam(2, STR_NETWORK_LAN + _network_connection);
@@ -105,12 +107,8 @@ static void NetworkGameWindowWndProc(Win
 			char servername[NETWORK_NAME_LENGTH];
 			const NetworkGameList *cur_item = _network_game_list;
 			while (cur_item != NULL) {
-#ifdef WITH_REV
 				bool compatible = (strncmp(cur_item->info.server_revision, _openttd_revision, NETWORK_REVISION_LENGTH - 1) == 0);
-#else
-				bool compatible = true; // We have no idea if we are compatible...
-#endif
-				if (strncmp(cur_item->info.server_revision, "norev000", sizeof(cur_item->info.server_revision)) == 0)
+				if (strncmp(cur_item->info.server_revision, NOREV_STRING, sizeof(cur_item->info.server_revision)) == 0)
 					compatible = true;
 
 				if (cur_item == _selected_item)
@@ -200,17 +198,15 @@ static void NetworkGameWindowWndProc(Win
 
 			y+=2;
 
-#ifdef WITH_REV
 			if (strncmp(_selected_item->info.server_revision, _openttd_revision, NETWORK_REVISION_LENGTH - 1) != 0) {
-				if (strncmp(_selected_item->info.server_revision, "norev000", sizeof(_selected_item->info.server_revision)) != 0)
+				if (strncmp(_selected_item->info.server_revision, NOREV_STRING, sizeof(_selected_item->info.server_revision)) != 0)
 					DrawStringMultiCenter(360, y, STR_NETWORK_VERSION_MISMATCH, 2); // server mismatch
-			} else
-#endif
-			if (_selected_item->info.clients_on == _selected_item->info.clients_max)
+			} else if (_selected_item->info.clients_on == _selected_item->info.clients_max) {
 				// Show: server full, when clients_on == clients_max
 				DrawStringMultiCenter(360, y, STR_NETWORK_SERVER_FULL, 2); // server full
-			else if (_selected_item->info.use_password)
+			} else if (_selected_item->info.use_password)
 				DrawStringMultiCenter(360, y, STR_NETWORK_PASSWORD, 2); // password warning
+
 			y+=10;
 		}
 	}	break;