diff --git a/reactos/base/applications/games/winmine/main.c b/reactos/base/applications/games/winmine/main.c
index 9aa0dd25ca8..1260c7b4c40 100644
--- a/reactos/base/applications/games/winmine/main.c
+++ b/reactos/base/applications/games/winmine/main.c
@@ -108,7 +108,7 @@ static void LoadBoard( BOARD *p_board )
         p_board->IsMarkQ = TRUE;
 
     for( i = 0; i < 3; i++ ) {
-        wsprintf( key_name, "Name%d", i+1 );
+        wsprintf( key_name, "Name%u", i+1 );
         size = sizeof( data );
         if( RegQueryValueEx( hkey, key_name, NULL, &type,
                 (LPBYTE) data, &size ) == ERROR_SUCCESS )
@@ -118,7 +118,7 @@ static void LoadBoard( BOARD *p_board )
     }
 
     for( i = 0; i < 3; i++ ) {
-        wsprintf( key_name, "Time%d", i+1 );
+        wsprintf( key_name, "Time%u", i+1 );
         size = sizeof( p_board->best_time[i] );
         if( !RegQueryValueEx( hkey, key_name, NULL, &type,
                 (LPBYTE) &p_board->best_time[i], &size ) == ERROR_SUCCESS )