diff --git a/dnsblast.h b/dnsblast.h
index 96b0605..ac6142a 100644
--- a/dnsblast.h
+++ b/dnsblast.h
@@ -34,7 +34,7 @@
 #endif
 
 #ifndef MAX_UDP_BUFFER_SIZE
-# define MAX_UDP_BUFFER_SIZE  2097152
+# define MAX_UDP_BUFFER_SIZE  (16 * 1024 * 1024)
 #endif
 
 #define REPEATED_NAME_PROBABILITY (int) ((RAND_MAX * 13854LL) / 100000LL)