diff --git a/lib/rules/no-unnecessary-waiting.js b/lib/rules/no-unnecessary-waiting.js
index 405f1f8e..65ddb8ac 100644
--- a/lib/rules/no-unnecessary-waiting.js
+++ b/lib/rules/no-unnecessary-waiting.js
@@ -48,12 +48,27 @@ function isNumberArgument (node) {
 }
 
 function isIdentifierNumberConstArgument (node, scope) {
-  if (node.arguments[0].type !== 'Identifier') {
-    return false
-  }
+  if (node.arguments[0].type !== 'Identifier') return false
 
   const resolvedIdentifier = scope.resolve(node.arguments[0]).resolved
-  const IdentifierValue = resolvedIdentifier.defs[0].node.init.value
+  const definition = resolvedIdentifier.defs[0]
+  const isVariable = definition.type === 'Variable'
+
+  // const amount = 1000 or const amount = '@alias'
+  // cy.wait(amount)
+  if (isVariable) {
+    if (!definition.node.init) return false
+
+    return typeof definition.node.init.value === 'number'
+  }
+
+  const param = definition.node.params[definition.index]
+
+  // function wait (amount) { cy.wait(amount) }
+  // we can't know the type of value, so don't fail
+  if (!param || param.type !== 'AssignmentPattern') return false
 
-  return typeof IdentifierValue === 'number'
+  // function wait (amount = 1) { cy.wait(amount) } or
+  // function wait (amount = '@alias') { cy.wait(amount) }
+  return typeof param.right.value === 'number'
 }
diff --git a/tests/lib/rules/no-unnecessary-waiting.js b/tests/lib/rules/no-unnecessary-waiting.js
index 50d1bca9..d1499aa6 100644
--- a/tests/lib/rules/no-unnecessary-waiting.js
+++ b/tests/lib/rules/no-unnecessary-waiting.js
@@ -20,6 +20,10 @@ ruleTester.run('no-unnecessary-waiting', rule, {
     { code: 'cy.tick(500)', parserOptions },
 
     { code: 'const someRequest="@someRequest"; cy.wait(someRequest)', parserOptions, errors },
+    { code: 'function customWait (alias = "@someRequest") { cy.wait(alias) }', parserOptions, errors },
+    { code: 'const customWait = (alias = "@someRequest") => { cy.wait(alias) }', parserOptions, errors },
+    { code: 'function customWait (ms) { cy.wait(ms) }', parserOptions, errors },
+    { code: 'const customWait = (ms) => { cy.wait(ms) }', parserOptions, errors },
   ],
 
   invalid: [
@@ -27,5 +31,7 @@ ruleTester.run('no-unnecessary-waiting', rule, {
     { code: 'cy.wait(100)', parserOptions, errors },
     { code: 'cy.wait(5000)', parserOptions, errors },
     { code: 'const someNumber=500; cy.wait(someNumber)', parserOptions, errors },
+    { code: 'function customWait (ms = 1) { cy.wait(ms) }', parserOptions, errors },
+    { code: 'const customWait = (ms = 1) => { cy.wait(ms) }', parserOptions, errors },
   ],
 })