Index: usr.bin/diff/diffreg.c
===================================================================
--- usr.bin/diff/diffreg.c
+++ usr.bin/diff/diffreg.c
@@ -1462,7 +1462,7 @@
 
 	printf("***************");
 	if (flags & (D_PROTOTYPE | D_MATCHLAST)) {
-		f = match_function(ixold, lowa - 1, f1);
+		f = match_function(ixold, cvp->a - 1 , f1);
 		if (f != NULL)
 			printf(" %s", f);
 	}
@@ -1563,13 +1563,14 @@
 	lowc = MAX(1, cvp->c - diff_context);
 	upd = MIN(len[1], context_vec_ptr->d + diff_context);
 
+
 	printf("@@ -");
 	uni_range(lowa, upb);
 	printf(" +");
 	uni_range(lowc, upd);
 	printf(" @@");
 	if (flags & (D_PROTOTYPE | D_MATCHLAST)) {
-		f = match_function(ixold, lowa - 1, f1);
+		f = match_function(ixold, cvp->a - 1, f1);
 		if (f != NULL)
 			printf(" %s", f);
 	}