diff --git a/src/utils/matching/matchRequestUrl.test.ts b/src/utils/matching/matchRequestUrl.test.ts
index 5ffdcfc92..0c99a0eff 100644
--- a/src/utils/matching/matchRequestUrl.test.ts
+++ b/src/utils/matching/matchRequestUrl.test.ts
@@ -64,6 +64,31 @@ describe('matchRequestUrl', () => {
 })
 
 describe('coercePath', () => {
+  test('escapes the colon in protocol', () => {
+    expect(coercePath('https://example.com')).toEqual('https\\://example.com')
+    expect(coercePath('https://example.com/:userId')).toEqual(
+      'https\\://example.com/:userId',
+    )
+    expect(coercePath('http://localhost:3000')).toEqual(
+      'http\\://localhost\\:3000',
+    )
+  })
+
+  test('escapes the colon before the port number', () => {
+    expect(coercePath('localhost:8080')).toEqual('localhost\\:8080')
+    expect(coercePath('http://127.0.0.1:8080')).toEqual(
+      'http\\://127.0.0.1\\:8080',
+    )
+    expect(coercePath('https://example.com:1234')).toEqual(
+      'https\\://example.com\\:1234',
+    )
+
+    expect(coercePath('localhost:8080/:5678')).toEqual('localhost\\:8080/:5678')
+    expect(coercePath('https://example.com:8080/:5678')).toEqual(
+      'https\\://example.com\\:8080/:5678',
+    )
+  })
+
   test('replaces wildcard with an unnnamed capturing group', () => {
     expect(coercePath('*')).toEqual('(.*)')
     expect(coercePath('**')).toEqual('(.*)')
@@ -86,14 +111,4 @@ describe('coercePath', () => {
       '/foo/:first/bar/:second*/(.*)',
     )
   })
-
-  test('escapes the semicolon in protocol', () => {
-    expect(coercePath('https://example.com')).toEqual('https\\://example.com')
-    expect(coercePath('https://example.com/:userId')).toEqual(
-      'https\\://example.com/:userId',
-    )
-    expect(coercePath('http://localhost:3000')).toEqual(
-      'http\\://localhost:3000',
-    )
-  })
 })
diff --git a/src/utils/matching/matchRequestUrl.ts b/src/utils/matching/matchRequestUrl.ts
index 61618e440..8f9c29ae0 100644
--- a/src/utils/matching/matchRequestUrl.ts
+++ b/src/utils/matching/matchRequestUrl.ts
@@ -36,12 +36,17 @@ export function coercePath(path: string): string {
             : `${parameterName}${expression}`
         },
       )
+      /**
+       * Escape the port so that "path-to-regexp" can match
+       * absolute URLs including port numbers.
+       */
+      .replace(/([^\/])(:)(?=\d+)/, '$1\\$2')
       /**
        * Escape the protocol so that "path-to-regexp" could match
        * absolute URL.
        * @see https://github.com/pillarjs/path-to-regexp/issues/259
        */
-      .replace(/^([^\/]+)(:)(?=\/\/)/g, '$1\\$2')
+      .replace(/^([^\/]+)(:)(?=\/\/)/, '$1\\$2')
   )
 }