diff --git a/src/types.h b/src/types.h
index 692a9bc6..d725c136 100644
--- a/src/types.h
+++ b/src/types.h
@@ -96,7 +96,7 @@ typedef uint64_t Key;
 typedef uint64_t Bitboard;
 
 const int MAX_MOVES = 256;
-const int MAX_PLY   = 8;
+const int MAX_PLY   = 128;
 
 /// A move needs 16 bits to be stored
 ///