diff --git a/diffcore-pickaxe.c b/diffcore-pickaxe.c
index 9476bd2..4b5d88e 100644
--- a/diffcore-pickaxe.c
+++ b/diffcore-pickaxe.c
@@ -222,11 +222,11 @@ void diffcore_pickaxe(struct diff_options *o)
 
 	if (opts & (DIFF_PICKAXE_REGEX | DIFF_PICKAXE_KIND_G)) {
 		int cflags = REG_EXTENDED | REG_NEWLINE;
-		if (o->flags.pickaxe_ignore_case)
+		if (o->pickaxe_opts & DIFF_PICKAXE_IGNORE_CASE)
 			cflags |= REG_ICASE;
 		regcomp_or_die(&regex, needle, cflags);
 		regexp = &regex;
-	} else if (o->flags.pickaxe_ignore_case &&
+	} else if (o->pickaxe_opts & DIFF_PICKAXE_IGNORE_CASE &&
 		   has_non_ascii(needle)) {
 		struct strbuf sb = STRBUF_INIT;
 		int cflags = REG_NEWLINE | REG_ICASE;
@@ -236,7 +236,7 @@ void diffcore_pickaxe(struct diff_options *o)
 		strbuf_release(&sb);
 		regexp = &regex;
 	} else {
-		kws = kwsalloc(o->flags.pickaxe_ignore_case
+		kws = kwsalloc(o->pickaxe_opts & DIFF_PICKAXE_IGNORE_CASE
 			       ? tolower_trans_tbl : NULL);
 		kwsincr(kws, needle, strlen(needle));
 		kwsprep(kws);