--- a/newgrf.c	Mon Nov 22 22:51:19 2004 +0000
+++ b/newgrf.c	Mon Nov 22 22:52:01 2004 +0000
@@ -1990,7 +1990,7 @@
 	struct GRFFile *newfile;
 
 	newfile = GetFileByFilename(filename);
-	if (newfile) {
+	if (newfile != NULL) {
 		/* We already loaded it once. */
 		newfile->sprite_offset = sprite_offset;
 		_cur_grffile = newfile;