diff --git a/go/csv.go b/go/csv.go
index 05686ba..c6a0daa 100644
--- a/go/csv.go
+++ b/go/csv.go
@@ -427,7 +427,11 @@ func Csv(j *jsonic.Jsonic, options map[string]any) error {
 	if err != nil {
 		return err
 	}
-	if err := j.Grammar(gs); err != nil {
+	if err := j.Grammar(gs, &jsonic.GrammarSetting{
+		Rule: &jsonic.GrammarSettingRule{
+			Alt: &jsonic.GrammarSettingAlt{G: "csv"},
+		},
+	}); err != nil {
 		return fmt.Errorf("failed to apply csv grammar: %w", err)
 	}
 
diff --git a/go/go.mod b/go/go.mod
index 55ab5a2..f732323 100644
--- a/go/go.mod
+++ b/go/go.mod
@@ -2,4 +2,4 @@ module github.com/jsonicjs/csv/go
 
 go 1.24.7
 
-require github.com/jsonicjs/jsonic/go v0.1.18
+require github.com/jsonicjs/jsonic/go v0.1.19-0.20260418194431-54100be22847
diff --git a/go/go.sum b/go/go.sum
index 7142a59..b960e5a 100644
--- a/go/go.sum
+++ b/go/go.sum
@@ -1,2 +1,4 @@
 github.com/jsonicjs/jsonic/go v0.1.18 h1:OW15hjFisrw2n7HE6zDuQAikW8A5NUW8OyP4SCG2oFg=
 github.com/jsonicjs/jsonic/go v0.1.18/go.mod h1:ObNKlCG7esWoi4AHCpdgkILvPINV8bpvkbCd4llGGUg=
+github.com/jsonicjs/jsonic/go v0.1.19-0.20260418194431-54100be22847 h1:+utFlbRO7upKu+DLO9tjUzWHacbxwsyiuFcCkylV3IA=
+github.com/jsonicjs/jsonic/go v0.1.19-0.20260418194431-54100be22847/go.mod h1:ObNKlCG7esWoi4AHCpdgkILvPINV8bpvkbCd4llGGUg=
diff --git a/package.json b/package.json
index 129bded..1db989e 100644
--- a/package.json
+++ b/package.json
@@ -41,6 +41,7 @@
   "devDependencies": {
     "@types/node": "^25.6.0",
     "csv-spectrum": "^2.0.0",
+    "jsonic": "github:jsonicjs/jsonic#main",
     "typescript": "^5.9.3"
   },
   "peerDependencies": {
diff --git a/src/csv.ts b/src/csv.ts
index c4eaf01..e117378 100644
--- a/src/csv.ts
+++ b/src/csv.ts
@@ -365,7 +365,7 @@ fields per row are expected.`,
   // Parse embedded grammar definition using a separate standard Jsonic instance.
   const grammarDef = Jsonic.make()(grammarText)
   grammarDef.ref = refs
-  jsonic.grammar(grammarDef)
+  jsonic.grammar(grammarDef, { rule: { alt: { g: 'csv' } } })
 
 
   // Rules list, elem, val are modified in code rather than the grammar file,