diff --git a/src/syzygy/tbprobe.cpp b/src/syzygy/tbprobe.cpp
index 062df5a0..31cf0700 100644
--- a/src/syzygy/tbprobe.cpp
+++ b/src/syzygy/tbprobe.cpp
@@ -383,6 +383,8 @@ WDLEntry::WDLEntry(const Position& pos, Key keys[])
 {
     memset(this, 0, sizeof(WDLEntry));
 
+    ready = false;
+
     key = keys[WHITE];
     key2 = keys[BLACK];
     pieceCount = popcount(pos.pieces());