diff --git a/src/attribution/onFCP.ts b/src/attribution/onFCP.ts
index 6c5bbd43..54f23110 100644
--- a/src/attribution/onFCP.ts
+++ b/src/attribution/onFCP.ts
@@ -17,7 +17,7 @@
 import {getBFCacheRestoreTime} from '../lib/bfcache.js';
 import {getLoadState} from '../lib/getLoadState.js';
 import {getNavigationEntry} from '../lib/getNavigationEntry.js';
-import {invalidTiming} from '../lib/invalidTiming.js';
+import {isInvalidTimestamp} from '../lib/isInvalidTimestamp.js';
 import {onFCP as unattributedOnFCP} from '../onFCP.js';
 import {
   FCPMetric,
@@ -34,7 +34,7 @@ const attributeFCP = (metric: FCPMetric): void => {
 
     if (navigationEntry) {
       const responseStart = navigationEntry.responseStart;
-      if (invalidTiming(responseStart)) return;
+      if (isInvalidTimestamp(responseStart)) return;
 
       const activationStart = navigationEntry.activationStart || 0;
       const ttfb = Math.max(0, responseStart - activationStart);
diff --git a/src/attribution/onLCP.ts b/src/attribution/onLCP.ts
index fc898de5..b546826b 100644
--- a/src/attribution/onLCP.ts
+++ b/src/attribution/onLCP.ts
@@ -16,7 +16,7 @@
 
 import {getNavigationEntry} from '../lib/getNavigationEntry.js';
 import {getSelector} from '../lib/getSelector.js';
-import {invalidTiming} from '../lib/invalidTiming.js';
+import {isInvalidTimestamp} from '../lib/isInvalidTimestamp.js';
 import {onLCP as unattributedOnLCP} from '../onLCP.js';
 import {
   LCPAttribution,
@@ -33,7 +33,7 @@ const attributeLCP = (metric: LCPMetric) => {
 
     if (navigationEntry) {
       const responseStart = navigationEntry.responseStart;
-      if (invalidTiming(responseStart)) return;
+      if (isInvalidTimestamp(responseStart)) return;
 
       const activationStart = navigationEntry.activationStart || 0;
       const lcpEntry = metric.entries[metric.entries.length - 1];
diff --git a/src/lib/invalidTiming.ts b/src/lib/isInvalidTimestamp.ts
similarity index 88%
rename from src/lib/invalidTiming.ts
rename to src/lib/isInvalidTimestamp.ts
index 3decdb9b..4311cf71 100644
--- a/src/lib/invalidTiming.ts
+++ b/src/lib/isInvalidTimestamp.ts
@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-export const invalidTiming = (timing: number) => {
+export const isInvalidTimestamp = (timestamp: DOMHighResTimeStamp) => {
   // In some cases no value is reported by the browser (for
   // privacy/security reasons), and in other cases (bugs) the value is
   // negative or is larger than the current page time. Ignore these cases:
   // https://github.com/GoogleChrome/web-vitals/issues/137
   // https://github.com/GoogleChrome/web-vitals/issues/162
   // https://github.com/GoogleChrome/web-vitals/issues/275
-  return timing <= 0 || timing > performance.now();
+  return timestamp <= 0 || timestamp > performance.now();
 };
diff --git a/src/onTTFB.ts b/src/onTTFB.ts
index dbab4448..5944bfb8 100644
--- a/src/onTTFB.ts
+++ b/src/onTTFB.ts
@@ -16,7 +16,7 @@
 
 import {bindReporter} from './lib/bindReporter.js';
 import {initMetric} from './lib/initMetric.js';
-import {invalidTiming} from './lib/invalidTiming.js';
+import {isInvalidTimestamp} from './lib/isInvalidTimestamp.js';
 import {onBFCacheRestore} from './lib/bfcache.js';
 import {getNavigationEntry} from './lib/getNavigationEntry.js';
 import {
@@ -78,7 +78,7 @@ export const onTTFB = (onReport: TTFBReportCallback, opts?: ReportOpts) => {
     if (navEntry) {
       const responseStart = navEntry.responseStart;
 
-      if (invalidTiming(responseStart)) return;
+      if (isInvalidTimestamp(responseStart)) return;
 
       // The activationStart reference is used because TTFB should be
       // relative to page activation rather than navigation start if the