diff --git a/src/position.cpp b/src/position.cpp
index 0a275b5e..7725b934 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -1662,6 +1662,18 @@ int Position::see(Square from, Square to) const {
 }
 
 
+/// Position::setStartState() copies the content of the argument
+/// inside startState and makes st point to it. This is needed
+/// when the st pointee could become stale, as example because
+/// the caller is about to going out of scope.
+
+void Position::setStartState(const StateInfo& s) {
+
+  startState = s;
+  st = &startState;
+}
+
+
 /// Position::clear() erases the position object to a pristine state, with an
 /// empty board, white to move, and no castling rights.
 
diff --git a/src/position.h b/src/position.h
index ae750697..676f68ef 100644
--- a/src/position.h
+++ b/src/position.h
@@ -240,6 +240,7 @@ public:
   bool square_is_weak(Square s, Color c) const;
 
   // Doing and undoing moves
+  void setStartState(const StateInfo& st);
   void do_move(Move m, StateInfo& st);
   void undo_move(Move m);
   void do_null_move(StateInfo& st);
diff --git a/src/uci.cpp b/src/uci.cpp
index b03752ed..6ce3bf85 100644
--- a/src/uci.cpp
+++ b/src/uci.cpp
@@ -22,6 +22,7 @@
 //// Includes
 ////
 
+#include <cassert>
 #include <iostream>
 #include <sstream>
 #include <string>
@@ -228,6 +229,9 @@ namespace {
                 if (RootPosition.rule_50_counter() == 0)
                     RootPosition.reset_game_ply();
             }
+            // Our StateInfo st is about going out of scope,
+            // so save its content before they disappear.
+            RootPosition.setStartState(st);
         }
     }
   }
@@ -321,6 +325,8 @@ namespace {
     if (moveTime)
         infinite = true;  // HACK
 
+    assert(RootPosition.is_ok());
+
     think(RootPosition, infinite, ponder, RootPosition.side_to_move(), time,
           inc, movesToGo, depth, nodes, moveTime, searchMoves);
   }