diff -r 200609cedea9 -r e8beb2845f13 src/industry_gui.cpp
--- a/src/industry_gui.cpp	Sat May 10 02:59:52 2008 +0000
+++ b/src/industry_gui.cpp	Sat May 10 08:58:52 2008 +0000
@@ -25,6 +25,7 @@
 #include "player_func.h"
 #include "settings_type.h"
 #include "tilehighlight_func.h"
+#include "string_func.h"
 
 #include "table/strings.h"
 #include "table/sprites.h"
@@ -592,7 +593,7 @@
 			break;
 
 		case WE_ON_EDIT_TEXT:
-			if (e->we.edittext.str[0] != '\0') {
+			if (!StrEmpty(e->we.edittext.str)) {
 				Industry* i = GetIndustry(w->window_number);
 				int line = WP(w, indview_d).editbox_line;