diff --git a/src/mills.cpp b/src/mills.cpp
index cb40107a..da07e4b6 100644
--- a/src/mills.cpp
+++ b/src/mills.cpp
@@ -26,6 +26,15 @@
 #include "option.h"
 #include "position.h"
 
+const char *loseReasonNoWayStr = "Player%d no way to go. Player%d win!";
+const char *loseReasonTimeOverStr = "Time over. Player%d win!";
+const char *drawReasonThreefoldRepetitionStr = "Threefold Repetition. Draw!";
+const char *drawReasonRule50Str = "Fifty-move rule. Draw!";
+const char *loseReasonBoardIsFullStr = "Full. Player2 win!";
+const char *drawReasonBoardIsFullStr = "Full. In draw!";
+const char *loseReasonlessThanThreeStr = "Player%d win!";
+const char *loseReasonResignStr = "Player%d give up!";
+
 namespace Mills
 {
 
diff --git a/src/mills.h b/src/mills.h
index 4daab421..dc559c61 100644
--- a/src/mills.h
+++ b/src/mills.h
@@ -22,14 +22,14 @@
 #include "types.h"
 #include "config.h"
 
-static const char *loseReasonNoWayStr = "Player%d no way to go. Player%d win!";
-static const char *loseReasonTimeOverStr = "Time over. Player%d win!";
-static const char *drawReasonThreefoldRepetitionStr = "Threefold Repetition. Draw!";
-static const char *drawReasonRule50Str = "Fifty-move rule. Draw!";
-static const char *loseReasonBoardIsFullStr = "Full. Player2 win!";
-static const char *drawReasonBoardIsFullStr = "Full. In draw!";
-static const char *loseReasonlessThanThreeStr = "Player%d win!";
-static const char *loseReasonResignStr = "Player%d give up!";
+extern const char *loseReasonNoWayStr;
+extern const char *loseReasonTimeOverStr;
+extern const char *drawReasonThreefoldRepetitionStr;
+extern const char *drawReasonRule50Str;
+extern const char *loseReasonBoardIsFullStr;
+extern const char *drawReasonBoardIsFullStr;
+extern const char *loseReasonlessThanThreeStr;
+extern const char *loseReasonResignStr;
 
 namespace Mills
 {
diff --git a/src/position.cpp b/src/position.cpp
index 31a45185..1fcabc7e 100644
--- a/src/position.cpp
+++ b/src/position.cpp
@@ -590,7 +590,7 @@ bool Position::reset()
             break;
     }
 
-    if (snprintf(record, RECORD_LEN_MAX, "r%1d s%03d t%02d",
+    if (snprintf(record, RECORD_LEN_MAX, "r%1d s%03zu t%02d",
                 r + 1, rule.maxStepsLedToDraw, 0) > 0) {
         return true;
     }
@@ -955,7 +955,7 @@ Color Position::get_winner() const noexcept
     return winner;
 }
 
-inline void Position::set_gameover(Color w, GameOverReason reason)
+void Position::set_gameover(Color w, GameOverReason reason)
 {
     phase = Phase::gameOver;
     gameOverReason = reason;
diff --git a/src/rule.h b/src/rule.h
index 443f5b8a..a7053fbc 100644
--- a/src/rule.h
+++ b/src/rule.h
@@ -52,7 +52,7 @@ struct Rule
     // Player may fly if he is down to three pieces.
     bool mayFly;
 
-    int maxStepsLedToDraw;
+    size_t maxStepsLedToDraw;
 };
 
 #define N_RULES 4
diff --git a/src/ucioption.cpp b/src/ucioption.cpp
index e608c086..86a5d775 100644
--- a/src/ucioption.cpp
+++ b/src/ucioption.cpp
@@ -119,7 +119,7 @@ void on_mayFly(const Option &o)
 
 void on_maxStepsLedToDraw(const Option &o)
 {
-    rule.maxStepsLedToDraw = (int)o;
+    rule.maxStepsLedToDraw = (size_t)o;
 }
 
 /// Our case insensitive less() function as required by UCI protocol
diff --git a/src/ui/qt/game.cpp b/src/ui/qt/game.cpp
index d9a678dc..2a67172c 100644
--- a/src/ui/qt/game.cpp
+++ b/src/ui/qt/game.cpp
@@ -385,7 +385,7 @@ void Game::setRule(int ruleNo, int stepLimited /*= -1*/, int timeLimited /*= -1*
     elapsedSeconds[BLACK] = elapsedSeconds[WHITE] = 0;
 
     char record[64] = { 0 };
-    if (snprintf(record, Position::RECORD_LEN_MAX, "r%1d s%03d t%02d", r + 1, rule.maxStepsLedToDraw, 0) <= 0) {
+    if (snprintf(record, Position::RECORD_LEN_MAX, "r%1d s%03zu t%02d", r + 1, rule.maxStepsLedToDraw, 0) <= 0) {
         assert(0);
     }
     string cmd(record);