1 files changed, 2 insertions, 2 deletions

diff --git a/csv.h b/csv.h
index 690df89..c7aaffc 100644
--- a/csv.h
+++ b/csv.h
@@ -58,8 +58,8 @@ void csv_cleanup(csv_t *csv);
 int csv_read(csv_t *csv, FILE *in);
 
 /* field access */
-int csv_nfields(csv_t *csv);
-const char * csv_field(csv_t *csv, int idx);
+int csv_nfields(const csv_t * const csv);
+const char * csv_field(const csv_t * const csv, int idx);
 
 /* write */
 void csv_write(FILE *out, const csv_t * const csv);