diff --git a/generate/generate.go b/generate/generate.go
index 6245064..9c92199 100644
--- a/generate/generate.go
+++ b/generate/generate.go
@@ -578,7 +578,7 @@ func (this *Generator) generateDecodeValue(typ Type, valueSource, tagSource stri
 //   - nn int
 func (this *Generator) generateDecodeBranchCall(typ Type, valueSource, tagSource string) (n int, err error) {
 	hash := HashType(typ)
-	nn, err := this.iprintf("nn, err = %s(%s, %s)\n", this.decodeBranchName(hash), valueSource, tagSource)
+	nn, err := this.iprintf("nn, err = %s(%s, decoder, %s)\n", this.decodeBranchName(hash), valueSource, tagSource)
 	n += nn; if err != nil { return n, err }
 	nn, err = this.generateErrorCheck()
 	n += nn; if err != nil { return n, err }