diff --git a/packages/next/src/client/components/react-dev-overlay/internal/helpers/get-socket-url.ts b/packages/next/src/client/components/react-dev-overlay/internal/helpers/get-socket-url.ts
index 3a3b87ac28a5b3..61b42d9afcb6d5 100644
--- a/packages/next/src/client/components/react-dev-overlay/internal/helpers/get-socket-url.ts
+++ b/packages/next/src/client/components/react-dev-overlay/internal/helpers/get-socket-url.ts
@@ -16,8 +16,8 @@ export function getSocketUrl(assetPrefix: string | undefined): string {
   const protocol = getSocketProtocol(assetPrefix || '')
 
   if (URL.canParse(prefix)) {
-    // since normalized asset prefix is ensured to be a URL format,
-    // we can safely replace the protocol
+    // since normalized asset prefix is ensured to be in URL format,
+    // we can trust to simply replace the protocol
     return prefix.replace(/^http/, 'ws')
   }
 
diff --git a/packages/next/src/shared/lib/normalized-asset-prefix.test.ts b/packages/next/src/shared/lib/normalized-asset-prefix.test.ts
index 03b8f4d0b43245..6f8a0773db519e 100644
--- a/packages/next/src/shared/lib/normalized-asset-prefix.test.ts
+++ b/packages/next/src/shared/lib/normalized-asset-prefix.test.ts
@@ -9,6 +9,11 @@ describe('normalizedAssetPrefix', () => {
     expect(normalizedAssetPrefix('')).toBe('')
   })
 
+  it('should return an empty string when assetPrefix is a single slash', () => {
+    expect(normalizedAssetPrefix('/')).toBe('')
+  })
+
+  // we expect an empty string because it could be an unnecessary trailing slash
   it('should remove leading slash(es) when assetPrefix has more than one', () => {
     expect(normalizedAssetPrefix('///path/to/asset')).toBe('/path/to/asset')
   })
@@ -21,9 +26,9 @@ describe('normalizedAssetPrefix', () => {
     expect(normalizedAssetPrefix('path/to/asset')).toBe('/path/to/asset')
   })
 
-  it('should return a pathname when assetPrefix is a URL', () => {
+  it('should return the URL when assetPrefix is a URL', () => {
     expect(normalizedAssetPrefix('https://example.com/path/to/asset')).toBe(
-      '/path/to/asset'
+      'https://example.com/path/to/asset'
     )
   })
 })