diff --git a/pino.js b/pino.js
index 740b97daa..2398e5acb 100644
--- a/pino.js
+++ b/pino.js
@@ -88,6 +88,9 @@ const serializers = Object.assign(Object.create(null), stdSerializers)
 function pino (...args) {
   const instance = {}
   const { opts, stream } = normalize(instance, caller(), ...args)
+
+  if (opts.level && typeof opts.level === 'string' && DEFAULT_LEVELS[opts.level.toLowerCase()] !== undefined) opts.level = opts.level.toLowerCase()
+
   const {
     redact,
     crlf,
diff --git a/test/levels.test.js b/test/levels.test.js
index 1581bc134..cdf650c35 100644
--- a/test/levels.test.js
+++ b/test/levels.test.js
@@ -704,3 +704,69 @@ test('trying to get levels when `this` is no longer a Pino instance returns an e
   const blankedLevelValue = notPinoInstance.getLevel()
   equal(blankedLevelValue, '')
 })
+
+test('accepts capital letter for INFO level', async ({ equal }) => {
+  const stream = sink()
+  const logger = pino({
+    level: 'INFO'
+  }, stream)
+
+  logger.info('test')
+  const { level } = await once(stream, 'data')
+  equal(level, 30)
+})
+
+test('accepts capital letter for FATAL level', async ({ equal }) => {
+  const stream = sink()
+  const logger = pino({
+    level: 'FATAL'
+  }, stream)
+
+  logger.fatal('test')
+  const { level } = await once(stream, 'data')
+  equal(level, 60)
+})
+
+test('accepts capital letter for ERROR level', async ({ equal }) => {
+  const stream = sink()
+  const logger = pino({
+    level: 'ERROR'
+  }, stream)
+
+  logger.error('test')
+  const { level } = await once(stream, 'data')
+  equal(level, 50)
+})
+
+test('accepts capital letter for WARN level', async ({ equal }) => {
+  const stream = sink()
+  const logger = pino({
+    level: 'WARN'
+  }, stream)
+
+  logger.warn('test')
+  const { level } = await once(stream, 'data')
+  equal(level, 40)
+})
+
+test('accepts capital letter for DEBUG level', async ({ equal }) => {
+  const stream = sink()
+  const logger = pino({
+    level: 'DEBUG'
+  }, stream)
+
+  logger.debug('test')
+  const { level } = await once(stream, 'data')
+  equal(level, 20)
+})
+
+test('accepts capital letter for TRACE level', async ({ equal }) => {
+  const stream = sink()
+  const logger = pino({
+    level: 'TRACE'
+  }, stream)
+
+  logger.trace('test')
+  const { level } = await once(stream, 'data')
+  equal(level, 10)
+})