diff --git a/candm.h b/candm.h
index a786ae7..34354e3 100644
--- a/candm.h
+++ b/candm.h
@@ -271,7 +271,7 @@ typedef struct {
 
 typedef struct {
   uint32_t type;
-  int8_t name[256];
+  uint8_t name[256];
   uint32_t port;
   int32_t minpoll;
   int32_t maxpoll;
@@ -732,7 +732,7 @@ typedef struct {
 } RPY_NTPData;
 
 typedef struct {
-  int8_t name[256];
+  uint8_t name[256];
   int32_t EOR;
 } RPY_NTPSourceName;
 
diff --git a/client.c b/client.c
index 5be4068..cf40ebf 100644
--- a/client.c
+++ b/client.c
@@ -2076,7 +2076,7 @@ get_source_name(IPAddr *ip_addr, char *buf, int size)
   UTI_IPHostToNetwork(ip_addr, &request.data.ntp_source_name.ip_addr);
   if (!request_reply(&request, &reply, RPY_NTP_SOURCE_NAME, 0) ||
       reply.data.ntp_source_name.name[sizeof (reply.data.ntp_source_name.name) - 1] != '\0' ||
-      snprintf(buf, size, "%s", reply.data.ntp_source_name.name) >= size)
+      snprintf(buf, size, "%s", (char *)reply.data.ntp_source_name.name) >= size)
     return 0;
 
   /* Make sure the name is printable */