diff --git a/index.js b/index.js
index 9fe115d..49c9ba6 100644
--- a/index.js
+++ b/index.js
@@ -59,27 +59,32 @@ async function fastifyRateLimit (fastify, settings) {
   }, settings.addHeadersOnExceeding)
 
   // Global maximum allowed requests
-  globalParams.max = ((typeof settings.max === 'number' && Number.isFinite(settings.max) && (settings.max = Math.trunc(settings.max)) >= 0) || typeof settings.max === 'function')
-    ? settings.max
-    : defaultMax
+  if (Number.isFinite(settings.max) && settings.max >= 0) {
+    globalParams.max = Math.trunc(settings.max)
+  } else if (
+    typeof settings.max === 'function'
+  ) {
+    globalParams.max = settings.max
+  } else {
+    globalParams.max = defaultMax
+  }
 
   // Global time window
-  const twType = typeof settings.timeWindow
-  globalParams.timeWindow = defaultTimeWindow
-  if (twType === 'function') {
-    globalParams.timeWindow = settings.timeWindow
-  } else if (twType === 'string') {
+  if (Number.isFinite(settings.timeWindow) && settings.timeWindow >= 0) {
+    globalParams.timeWindow = Math.trunc(settings.timeWindow)
+  } else if (typeof settings.timeWindow === 'string') {
     globalParams.timeWindow = ms.parse(settings.timeWindow)
   } else if (
-    twType === 'number' &&
-    Number.isFinite(settings.timeWindow) && settings.timeWindow >= 0
+    typeof settings.timeWindow === 'function'
   ) {
-    globalParams.timeWindow = Math.trunc(settings.timeWindow)
+    globalParams.timeWindow = settings.timeWindow
+  } else {
+    globalParams.timeWindow = defaultTimeWindow
   }
 
   globalParams.hook = settings.hook || defaultHook
   globalParams.allowList = settings.allowList || settings.whitelist || null
-  globalParams.ban = typeof settings.ban === 'number' && Number.isFinite(settings.ban) && settings.ban >= 0 ? Math.trunc(settings.ban) : -1
+  globalParams.ban = Number.isFinite(settings.ban) && settings.ban >= 0 ? Math.trunc(settings.ban) : -1
   globalParams.onBanReach = typeof settings.onBanReach === 'function' ? settings.onBanReach : null
   globalParams.onExceeding = typeof settings.onExceeding === 'function' ? settings.onExceeding : null
   globalParams.onExceeded = typeof settings.onExceeded === 'function' ? settings.onExceeded : null
@@ -150,21 +155,21 @@ async function fastifyRateLimit (fastify, settings) {
 function mergeParams (...params) {
   const result = Object.assign({}, ...params)
 
-  if (typeof result.timeWindow === 'string') {
-    result.timeWindow = ms.parse(result.timeWindow)
-  } else if (typeof result.timeWindow === 'number' && Number.isFinite(result.timeWindow) && result.timeWindow >= 0) {
+  if (Number.isFinite(result.timeWindow) && result.timeWindow >= 0) {
     result.timeWindow = Math.trunc(result.timeWindow)
+  } else if (typeof result.timeWindow === 'string') {
+    result.timeWindow = ms.parse(result.timeWindow)
   } else if (typeof result.timeWindow !== 'function') {
     result.timeWindow = defaultTimeWindow
   }
 
-  if (typeof result.max === 'number' && Number.isFinite(result.max) && result.max >= 0) {
+  if (Number.isFinite(result.max) && result.max >= 0) {
     result.max = Math.trunc(result.max)
   } else if (typeof result.max !== 'function') {
     result.max = defaultMax
   }
 
-  if (typeof result.ban === 'number' && Number.isFinite(result.ban) && result.ban >= 0) {
+  if (Number.isFinite(result.ban) && result.ban >= 0) {
     result.ban = Math.trunc(result.ban)
   } else {
     result.ban = -1