diff --git a/src/viewer/dump/dump.c b/src/viewer/dump/dump.c
index e88115fbf..9b38ab2de 100644
--- a/src/viewer/dump/dump.c
+++ b/src/viewer/dump/dump.c
@@ -324,11 +324,11 @@ add_document_to_string(struct string *string, struct document *document)
 	if_assert_failed return NULL;
 
 	for (y = 0; y < document->height; y++) {
-		struct screen_char *pos = document->data[y].chars;
 		int white = 0;
 		int x;
 
 		for (x = 0; x < document->data[y].length; x++) {
+			struct screen_char *pos = &document->data[y].chars[x];
 			unsigned char data = pos->data;
 			unsigned int frame = (pos->attr & SCREEN_ATTR_FRAME);