diff --git a/pkg/build/norelease.go b/pkg/build/norelease.go
new file mode 100644
index 000000000..f3ceb86ed
--- /dev/null
+++ b/pkg/build/norelease.go
@@ -0,0 +1,7 @@
+//go:build !release
+
+package build
+
+func initReleaseOptions() {
+	CheckChildAlreadyExists = true
+}
diff --git a/pkg/build/options.go b/pkg/build/options.go
new file mode 100644
index 000000000..101e32b2e
--- /dev/null
+++ b/pkg/build/options.go
@@ -0,0 +1,9 @@
+package build
+
+var (
+	CheckChildAlreadyExists = true
+)
+
+func init() {
+	initReleaseOptions()
+}
diff --git a/pkg/build/release.go b/pkg/build/release.go
new file mode 100644
index 000000000..aea0c4cf9
--- /dev/null
+++ b/pkg/build/release.go
@@ -0,0 +1,7 @@
+//go:build release
+
+package build
+
+func initReleaseOptions() {
+	CheckChildAlreadyExists = false
+}
diff --git a/pkg/decode/decode.go b/pkg/decode/decode.go
index e899eac30..fcd985c19 100644
--- a/pkg/decode/decode.go
+++ b/pkg/decode/decode.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"github.com/wader/fq/pkg/build"
 	"io"
 	"math/big"
 	"regexp"
@@ -720,7 +721,7 @@ func (d *D) AddChild(v *Value) {
 
 	switch fv := d.Value.V.(type) {
 	case *Compound:
-		if !fv.IsArray {
+		if build.CheckChildAlreadyExists && !fv.IsArray {
 			for _, ff := range fv.Children {
 				if ff.Name == v.Name {
 					d.Fatalf("%q already exist in struct %s", v.Name, d.Value.Name)