diff --git a/cmd/mdatagen/metricdata.go b/cmd/mdatagen/metricdata.go
index 27c772c90c6b..c44cf4d70751 100644
--- a/cmd/mdatagen/metricdata.go
+++ b/cmd/mdatagen/metricdata.go
@@ -83,7 +83,7 @@ func (ndp NumberDataPoints) BasicType() string {
 }
 
 type gauge struct {
-	NumberDataPoints `yaml:",inline"`
+	NumberDataPoints `mapstructure:",squash"`
 }
 
 func (d gauge) Type() string {