diff --git a/src/cmd/ld/dwarf.c b/src/cmd/ld/dwarf.c
index f3e8781641..c2fd07702d 100644
--- a/src/cmd/ld/dwarf.c
+++ b/src/cmd/ld/dwarf.c
@@ -266,7 +266,7 @@ static struct DWAbbrev {
 		DW_TAG_subrange_type, DW_CHILDREN_no,
 		// No name!
 		DW_AT_type,	 DW_FORM_ref_addr,
-		DW_AT_upper_bound, DW_FORM_data1,
+		DW_AT_upper_bound, DW_FORM_udata,
 		0, 0
 	},