1 files changed, 1 insertions, 1 deletions
diff --git a/apps/ca.c b/apps/ca.c
index 33e2391028..2a83d1936e 100644
--- a/apps/ca.c
+++ b/apps/ca.c
@@ -2560,7 +2560,7 @@ static int get_certificate_status(const char *serial, CA_DB *db)
 			
 	/* Make it Upper Case */
 	for (i=0; row[DB_serial][i] != '\0'; i++)
-		row[DB_serial][i] = toupper(row[DB_serial][i]);
+		row[DB_serial][i] = toupper((unsigned char)row[DB_serial][i]);
 	
 
 	ok=1;