diff --git a/package-lock.json b/package-lock.json
index 31a3ea9..364ae8e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@knighted/module",
-  "version": "1.4.0-rc.1",
+  "version": "1.4.0-rc.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@knighted/module",
-      "version": "1.4.0-rc.1",
+      "version": "1.4.0-rc.2",
       "license": "MIT",
       "dependencies": {
         "glob": "^13.0.0",
diff --git a/package.json b/package.json
index 1b7056e..7e1e942 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@knighted/module",
-  "version": "1.4.0-rc.1",
+  "version": "1.4.0-rc.2",
   "description": "Bidirectional transform for ES modules and CommonJS.",
   "type": "module",
   "main": "dist/module.js",
diff --git a/src/format.ts b/src/format.ts
index 0802f42..976ed98 100644
--- a/src/format.ts
+++ b/src/format.ts
@@ -348,11 +348,12 @@ const dualPackageHazardDiagnostics = async (params: {
     const diagFile = origin?.filePath ?? filePath
 
     if (hasImport && hasRequire) {
-      const importSpecs = usage.imports.map(u =>
-        u.subpath ? `${pkg}/${u.subpath}` : pkg,
+      const uniq = <T>(items: T[]) => [...new Set(items)]
+      const importSpecs = uniq(
+        usage.imports.map(u => (u.subpath ? `${pkg}/${u.subpath}` : pkg)),
       )
-      const requireSpecs = usage.requires.map(u =>
-        u.subpath ? `${pkg}/${u.subpath}` : pkg,
+      const requireSpecs = uniq(
+        usage.requires.map(u => (u.subpath ? `${pkg}/${u.subpath}` : pkg)),
       )
 
       diags.push({