diff --git a/src/material.h b/src/material.h
index 62f4f9a0..7730a4c9 100644
--- a/src/material.h
+++ b/src/material.h
@@ -59,7 +59,7 @@ public:
   Value evaluate(const Position& pos) const;
 
 private:
-  void clear();
+  inline void clear();
 
   Key key;
   int16_t mgValue;
diff --git a/src/pawns.h b/src/pawns.h
index abb4e52f..4b4a8a55 100644
--- a/src/pawns.h
+++ b/src/pawns.h
@@ -59,7 +59,7 @@ public:
   void setKingShelter(Color c, Square ksq, int value);
 
 private:
-  void clear();
+  inline void clear();
 
   Key key;
   Bitboard passedPawns;