diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index e3eb0b33..32bd35f6 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -556,7 +556,7 @@ namespace {
             ei.value -= Sign[Us] * ThreatedByPawnPenalty[Piece];
 
         // Bishop and knight outposts squares
-        if ((Piece == BISHOP || Piece == KNIGHT) && pos.square_is_weak(s, Them))
+        if ((Piece == BISHOP || Piece == KNIGHT) && pos.square_is_weak(s, Us))
             evaluate_outposts<Piece, Us>(pos, ei, s);
 
         // Special patterns: trapped bishops on a7/h7/a2/h2
diff --git a/src/position.h b/src/position.h
index 8121bec1..6472d735 100644
--- a/src/position.h
+++ b/src/position.h
@@ -483,7 +483,7 @@ inline bool Position::pawn_is_passed(Color c, Square s) const {
 }
 
 inline bool Position::square_is_weak(Square s, Color c) const {
-  return !(pieces(PAWN, c) & outpost_mask(opposite_color(c), s));
+  return !(pieces(PAWN, opposite_color(c)) & outpost_mask(c, s));
 }
 
 inline Key Position::get_key() const {