diff --git a/internal/rpc/exec.go b/internal/rpc/exec.go
index 6dc47a0..4e3430e 100644
--- a/internal/rpc/exec.go
+++ b/internal/rpc/exec.go
@@ -53,6 +53,7 @@ func (rpc *RPC) Exec(stream grpc.BidiStreamingServer[ExecRequest, ExecResponse])
 			Rows: uint16(firstExecRequestCommand.Command.GetTerminalSize().GetRows()),
 			Cols: uint16(firstExecRequestCommand.Command.GetTerminalSize().GetCols()),
 		})
+		defer ptmx.Close()
 
 		if firstExecRequestCommand.Command.Interactive {
 			stdin = ptmx