diff --git a/source/server/network/ChatCommandHandler.cpp b/source/server/network/ChatCommandHandler.cpp
index 34e0ce7e..e20080cc 100644
--- a/source/server/network/ChatCommandHandler.cpp
+++ b/source/server/network/ChatCommandHandler.cpp
@@ -157,7 +157,7 @@ void ChatCommandHandler::timeCommand(const std::vector<std::string> &command, Cl
 	}
 	else if (command.at(1) == "add") {
 		try {
-			u64 ticks = std::stoull(command.at(2));
+			s64 ticks = std::stoll(command.at(2));
 
 			GameTime::setTicks(GameTime::getTicks() + ticks);