diff --git a/pkg/proc/gdbserial/undo.go b/pkg/proc/gdbserial/undo.go
index 49a7d9be..e39ff568 100644
--- a/pkg/proc/gdbserial/undo.go
+++ b/pkg/proc/gdbserial/undo.go
@@ -182,6 +182,7 @@ type session struct {
 	Sysroot               interface{}             `json:"sysroot,omitempty"`
 	ConvenienceVariables  interface{}             `json:"convenience_variables,omitempty"`
 	TelemetryId           interface{}             `json:"telemetry_id,omitempty"`
+	Language              interface{}             `json:"language,omitempty"`
 }
 
 // Get the path to the UDB session file for the current recording.