diff --git a/cmd/tf-migrate/main.go b/cmd/tf-migrate/main.go
index 167bed09..15455bbe 100644
--- a/cmd/tf-migrate/main.go
+++ b/cmd/tf-migrate/main.go
@@ -1193,9 +1193,13 @@ func applyGlobalPostprocessing(log hclog.Logger, cfg config, outputPaths []strin
 		// Example: cloudflare_tunnel.<name>.cname → cloudflare_zero_trust_tunnel_cloudflared.<name>.name
 		// This must happen BEFORE resource type renames so the pattern matches the old resource type
 		for _, mapping := range computedAttrMappings {
-			// Build regex pattern to match old resource type + old attribute
-			// Pattern: cloudflare_tunnel\.([a-zA-Z0-9_-]+)\.cname
-			pattern := mapping.OldResourceType + `\.([a-zA-Z0-9_-]+)\.` + mapping.OldAttribute
+			// Build regex pattern to match old resource type + old attribute.
+			// Use regexp.QuoteMeta so resource types containing "." (e.g.
+			// "data.cloudflare_zone") are treated as literals, not wildcards.
+			// The trailing \b ensures ".zone" does not match the prefix of
+			// ".zone_id" (which would produce the nonsense attribute "name_id").
+			// Pattern example: cloudflare_tunnel\.([a-zA-Z0-9_-]+)\.cname\b
+			pattern := regexp.QuoteMeta(mapping.OldResourceType) + `\.([a-zA-Z0-9_-]+)\.` + regexp.QuoteMeta(mapping.OldAttribute) + `\b`
 			replacement := mapping.NewResourceType + ".$1." + mapping.NewAttribute
 			newContent := regexReplaceSkippingMovedBlocks(contentStr, pattern, replacement)
 
@@ -1228,9 +1232,10 @@ func applyGlobalPostprocessing(log hclog.Logger, cfg config, outputPaths []strin
 		// Pattern: data.cloudflare_zones.<instance_name>.zones → data.cloudflare_zones.<instance_name>.result
 		// We need to match: <ResourceType>.<instance_name>.<OldAttribute>
 		for _, rename := range attributeRenames {
-			// Build regex pattern: data\.cloudflare_zones\.([a-zA-Z0-9_-]+)\.zones
-			// The instance name can contain letters, numbers, underscores, and hyphens
-			pattern := rename.ResourceType + `\.([a-zA-Z0-9_-]+)\.` + rename.OldAttribute
+			// Build regex pattern: data\.cloudflare_zones\.([a-zA-Z0-9_-]+)\.zones\b
+			// Use regexp.QuoteMeta so resource types with "." are treated as literals.
+			// The trailing \b prevents clipping prefixes of longer attribute names.
+			pattern := regexp.QuoteMeta(rename.ResourceType) + `\.([a-zA-Z0-9_-]+)\.` + regexp.QuoteMeta(rename.OldAttribute) + `\b`
 			replacement := rename.ResourceType + ".$1." + rename.NewAttribute
 			newContent := regexReplaceSkippingMovedBlocks(contentStr, pattern, replacement)
 
diff --git a/cmd/tf-migrate/main_postprocessing_test.go b/cmd/tf-migrate/main_postprocessing_test.go
index f9ca6545..18af480b 100644
--- a/cmd/tf-migrate/main_postprocessing_test.go
+++ b/cmd/tf-migrate/main_postprocessing_test.go
@@ -3,6 +3,7 @@ package main
 import (
 	"os"
 	"path/filepath"
+	"regexp"
 	"testing"
 
 	"github.com/hashicorp/go-hclog"
@@ -199,3 +200,70 @@ func TestScanForInvalidAttributeReferences(t *testing.T) {
 		}
 	})
 }
+
+// TestComputedAttrMappingBoundary verifies that the computed-attribute rewrite
+// regex uses a word boundary so that ".zone" does not corrupt ".zone_id".
+//
+// Regression: without \b, the zone resource rule
+//   cloudflare_zone\.([a-zA-Z0-9_-]+)\.zone → cloudflare_zone.$1.name
+// would match ".zone_id", yielding ".name_id" which is not a valid attribute.
+//
+// Also validates that the data.cloudflare_zone zone_id→id rule fires correctly.
+func TestComputedAttrMappingBoundary(t *testing.T) {
+	// Simulate the exact patterns built by applyGlobalPostprocessing after
+	// the regexp.QuoteMeta + \b fix.
+
+	// Rule 1: cloudflare_zone resource — .zone → .name
+	resourcePattern := regexp.QuoteMeta("cloudflare_zone") + `\.([a-zA-Z0-9_-]+)\.` + regexp.QuoteMeta("zone") + `\b`
+	resourceReplacement := "cloudflare_zone.$1.name"
+
+	// Rule 2: data.cloudflare_zone datasource — .zone_id → .id
+	datasourcePattern := regexp.QuoteMeta("data.cloudflare_zone") + `\.([a-zA-Z0-9_-]+)\.` + regexp.QuoteMeta("zone_id") + `\b`
+	datasourceReplacement := "data.cloudflare_zone.$1.id"
+
+	t.Run("resource .zone → .name (positive case)", func(t *testing.T) {
+		input := `locals { domain = cloudflare_zone.minimal.zone }`
+		got := regexReplaceSkippingMovedBlocks(input, resourcePattern, resourceReplacement)
+		want := `locals { domain = cloudflare_zone.minimal.name }`
+		if got != want {
+			t.Errorf("resource rule\ngot:  %s\nwant: %s", got, want)
+		}
+	})
+
+	t.Run("resource rule does NOT mangle data source .zone_id", func(t *testing.T) {
+		input := `id = "${data.cloudflare_zone.this.zone_id}/security_header"`
+		got := regexReplaceSkippingMovedBlocks(input, resourcePattern, resourceReplacement)
+		// Must not produce "name_id"; value should be unchanged by the resource rule.
+		if got != input {
+			t.Errorf("resource rule must not touch data.cloudflare_zone.*.zone_id\ngot:  %s\nwant: %s", got, input)
+		}
+	})
+
+	t.Run("datasource .zone_id → .id", func(t *testing.T) {
+		input := `id = "${data.cloudflare_zone.this.zone_id}/security_header"`
+		got := regexReplaceSkippingMovedBlocks(input, datasourcePattern, datasourceReplacement)
+		want := `id = "${data.cloudflare_zone.this.id}/security_header"`
+		if got != want {
+			t.Errorf("datasource rule\ngot:  %s\nwant: %s", got, want)
+		}
+	})
+
+	t.Run("datasource .zone_id → .id in plain assignment", func(t *testing.T) {
+		input := `output "zone_id" { value = data.cloudflare_zone.by_id.zone_id }`
+		got := regexReplaceSkippingMovedBlocks(input, datasourcePattern, datasourceReplacement)
+		want := `output "zone_id" { value = data.cloudflare_zone.by_id.id }`
+		if got != want {
+			t.Errorf("datasource rule (plain assignment)\ngot:  %s\nwant: %s", got, want)
+		}
+	})
+
+	t.Run("datasource .name is preserved (valid v5 output)", func(t *testing.T) {
+		input := `locals { zone_name = data.cloudflare_zone.this.name }`
+		// Apply both rules; neither should touch .name.
+		got := regexReplaceSkippingMovedBlocks(input, resourcePattern, resourceReplacement)
+		got = regexReplaceSkippingMovedBlocks(got, datasourcePattern, datasourceReplacement)
+		if got != input {
+			t.Errorf("data source .name must not be rewritten\ngot:  %s\nwant: %s", got, input)
+		}
+	})
+}
diff --git a/integration/v4_to_v5/testdata/zone_datasource/expected/zone.tf b/integration/v4_to_v5/testdata/zone_datasource/expected/zone.tf
index e8a18cb6..3b49b24b 100644
--- a/integration/v4_to_v5/testdata/zone_datasource/expected/zone.tf
+++ b/integration/v4_to_v5/testdata/zone_datasource/expected/zone.tf
@@ -99,3 +99,15 @@ data "cloudflare_zone" "from_local" {
     }
   }
 }
+
+# Scenario 8: cross-file zone_id output reference (tests that .zone_id → .id)
+# The zone data source's v4 zone_id output must become .id in v5.
+# Regression: a naive .zone → .name rewrite would turn .zone_id into .name_id.
+import {
+  to = cloudflare_zone_setting.cftftest_security_header
+  id = "${data.cloudflare_zone.by_id.id}/security_header"
+}
+
+output "cftftest_zone_identifier" {
+  value = data.cloudflare_zone.by_id.id
+}
diff --git a/integration/v4_to_v5/testdata/zone_datasource/input/zone.tf b/integration/v4_to_v5/testdata/zone_datasource/input/zone.tf
index 0fdcf3a7..8b141663 100644
--- a/integration/v4_to_v5/testdata/zone_datasource/input/zone.tf
+++ b/integration/v4_to_v5/testdata/zone_datasource/input/zone.tf
@@ -81,3 +81,15 @@ data "cloudflare_zone" "from_local" {
   name       = coalesce(local.zone_domain, data.cloudflare_zone.by_id.name)
   account_id = coalesce(local.cf_account_id, var.cloudflare_account_id)
 }
+
+# Scenario 8: cross-file zone_id output reference (tests that .zone_id → .id)
+# The zone data source's v4 zone_id output must become .id in v5.
+# Regression: a naive .zone → .name rewrite would turn .zone_id into .name_id.
+import {
+  to = cloudflare_zone_setting.cftftest_security_header
+  id = "${data.cloudflare_zone.by_id.zone_id}/security_header"
+}
+
+output "cftftest_zone_identifier" {
+  value = data.cloudflare_zone.by_id.zone_id
+}
diff --git a/internal/datasources/zone/v4_to_v5.go b/internal/datasources/zone/v4_to_v5.go
index 84c7a677..f5fa45f9 100644
--- a/internal/datasources/zone/v4_to_v5.go
+++ b/internal/datasources/zone/v4_to_v5.go
@@ -46,6 +46,21 @@ func (m *V4ToV5Migrator) GetResourceRename() ([]string, string) {
 	return []string{"data.cloudflare_zone"}, "data.cloudflare_zone"
 }
 
+// GetComputedAttributeMappings implements the ComputedAttributeMapper interface.
+// In v4, the zone data source exposed a `zone_id` computed output attribute
+// (e.g. data.cloudflare_zone.example.zone_id). In v5, the zone identifier is
+// accessed as `id`, so cross-file references must be rewritten accordingly.
+func (m *V4ToV5Migrator) GetComputedAttributeMappings() []transform.ComputedAttributeMapping {
+	return []transform.ComputedAttributeMapping{
+		{
+			OldResourceType: "data.cloudflare_zone",
+			OldAttribute:    "zone_id",
+			NewResourceType: "data.cloudflare_zone",
+			NewAttribute:    "id",
+		},
+	}
+}
+
 // TransformConfig handles configuration file transformations.
 // Scenarios:
 // 1. zone_id only → No changes