diff --git a/net/slirp.c b/net/slirp.c
index 95934fb36d..b34cb29276 100644
--- a/net/slirp.c
+++ b/net/slirp.c
@@ -498,7 +498,8 @@ static int net_slirp_init(NetClientState *peer, const char *model,
     }
     if (vprefix6_len < 0 || vprefix6_len > 126) {
         error_setg(errp,
-                   "Invalid prefix provided (prefix len must be in range 0-126");
+                   "Invalid IPv6 prefix provided "
+                   "(IPv6 prefix length must be between 0 and 126)");
         return -1;
     }