diff --git a/src/command.cpp b/src/command.cpp
--- a/src/command.cpp
+++ b/src/command.cpp
@@ -591,7 +591,7 @@ CommandCost DoCommandPInternal(TileIndex
 	if (tile != 0 && (tile >= MapSize() || (!IsValidTile(tile) && (cmd_flags & CMD_ALL_TILES) == 0))) return_dcpi(CMD_ERROR, false);
 
 	/* Always execute server and spectator commands as spectator */
-	bool exec_as_spectator = cmd_flags & (CMD_SPECTATOR | CMD_SERVER);
+	bool exec_as_spectator = (cmd_flags & (CMD_SPECTATOR | CMD_SERVER)) != 0;
 
 	/* If the company isn't valid it may only do server command or start a new company!
 	 * The server will ditch any server commands a client sends to it, so effectively