diff --git a/types/trace/trace.go b/types/trace/trace.go
index 708df9e9d6e0..11b37c855e33 100644
--- a/types/trace/trace.go
+++ b/types/trace/trace.go
@@ -184,7 +184,7 @@ type ArgMeta struct {
 	Type string `json:"type"`
 
 	// DecodeAs includes designates the decoding strategy.
-	DecodeAs DecodeAs `json: "-`
+	DecodeAs DecodeAs `json:"-"`
 	// Zero contains the zero value for Argument.Value.
 	// It is automatically initialized based on ArgMeta.Type when the Core DefinitionGroup is initialized.
 	Zero interface{} `json:"-"`