diff --git a/lib/utils.h b/lib/utils.h
index a2c72e2..1e42242 100644
--- a/lib/utils.h
+++ b/lib/utils.h
@@ -24,7 +24,7 @@
 #include <iostream>
 
 const int MAX_SYM = 520; // enough for 1500 byte BPSK 1/2
-const int MAX_BITS = 1530 * 8;
+const int MAX_BITS = 1550 * 8 * 2;
 
 #define dout d_debug && std::cout