1 files changed, 3 insertions, 3 deletions

diff --git a/csv.c b/csv.c
index a6d96e6..4b3325d 100644
--- a/csv.c
+++ b/csv.c
@@ -455,7 +455,7 @@ csv_write_field(FILE *out, const char *field, const csv_options_t * const csv_op
         assert(field != NULL);
         assert(out != NULL);
 
-        const char DELIM = csv_options->field_delimiter;
+        register const int DELIM = csv_options->field_delimiter;
 
         if ( *field != '\0' ) {
                 putc(DELIM, out);
@@ -487,7 +487,7 @@ csv_write(FILE *out, const csv_t * const csv)
         assert(csv->csv_string.str != NULL);
         assert(csv->csv_field.fields != NULL);
 
-        const char SEP = csv->csv_options->field_separator;
+        register const int SEP = csv->csv_options->field_separator;
 
         if ( 0 < csv->csv_field.pos ) {
                 const char *str = csv->csv_string.str;
@@ -518,7 +518,7 @@ csv_write_ex(FILE *out, int n, const char *fields[], const csv_options_t * csv_o
                 csv_options = &csv_default_options;
         }
 
-        const char SEP = csv_options->field_separator;
+        register const int SEP = csv_options->field_separator;
 
         // process first field
         if ( 0 != n && *fields != NULL ) {