diff --git a/daemon/commands/register-status.cc b/daemon/commands/register-status.cc
index 16e767117..0c21eaac7 100644
--- a/daemon/commands/register-status.cc
+++ b/daemon/commands/register-status.cc
@@ -65,8 +65,8 @@ void RegisterStatusCommand::exec(Daemon *app, const char *args) {
 		}
 		app->sendResponse(response);
 	} else {
+		ist.clear();
 		ist.str(param);
-		ist.seekg(0);
 		ist >> pid;
 		if (ist.fail()) {
 			app->sendResponse(Response("Incorrect parameter.", Response::Error));
diff --git a/daemon/commands/unregister.cc b/daemon/commands/unregister.cc
index 4df79be21..60acb6b02 100644
--- a/daemon/commands/unregister.cc
+++ b/daemon/commands/unregister.cc
@@ -32,8 +32,8 @@ void UnregisterCommand::exec(Daemon *app, const char *args) {
 			}
 		}
 	} else {
+		ist.clear();
 		ist.str(param);
-		ist.seekg(0);
 		ist >> pid;
 		if (ist.fail()) {
 			app->sendResponse(Response("Incorrect parameter.", Response::Error));