diff --git a/src/attribution/onCLS.ts b/src/attribution/onCLS.ts
index 0e62a7d8..1b86b85d 100644
--- a/src/attribution/onCLS.ts
+++ b/src/attribution/onCLS.ts
@@ -81,7 +81,7 @@ export const onCLS = (
   opts?: ReportOpts
 ) => {
   unattributedOnCLS(
-    ((metric: CLSMetric) => {
+    ((metric: CLSMetricWithAttribution) => {
       attributeCLS(metric);
       onReport(metric);
     }) as CLSReportCallback,
diff --git a/src/types/base.ts b/src/types/base.ts
index 3cce6b7f..f1e4b401 100644
--- a/src/types/base.ts
+++ b/src/types/base.ts
@@ -116,6 +116,10 @@ export interface ReportCallback {
   (metric: Metric): void;
 }
 
+export interface ReportCallbackWithAttribution {
+  (metric: MetricWithAttribution): void;
+}
+
 export interface ReportOpts {
   reportAllChanges?: boolean;
   durationThreshold?: number;
diff --git a/src/types/cls.ts b/src/types/cls.ts
index 58dbce35..ef99741e 100644
--- a/src/types/cls.ts
+++ b/src/types/cls.ts
@@ -14,7 +14,12 @@
  * limitations under the License.
  */
 
-import {LoadState, Metric, ReportCallback} from './base.js';
+import {
+  LoadState,
+  Metric,
+  ReportCallback,
+  ReportCallbackWithAttribution,
+} from './base.js';
 
 /**
  * A CLS-specific version of the Metric object.
@@ -83,6 +88,7 @@ export interface CLSReportCallback extends ReportCallback {
 /**
  * A CLS-specific version of the ReportCallback function with attribution.
  */
-export interface CLSReportCallbackWithAttribution extends CLSReportCallback {
+export interface CLSReportCallbackWithAttribution
+  extends ReportCallbackWithAttribution {
   (metric: CLSMetricWithAttribution): void;
 }
diff --git a/src/types/fcp.ts b/src/types/fcp.ts
index b7755629..ca65f4dd 100644
--- a/src/types/fcp.ts
+++ b/src/types/fcp.ts
@@ -14,7 +14,12 @@
  * limitations under the License.
  */
 
-import {LoadState, Metric, ReportCallback} from './base.js';
+import {
+  LoadState,
+  Metric,
+  ReportCallback,
+  ReportCallbackWithAttribution,
+} from './base.js';
 import {NavigationTimingPolyfillEntry} from './polyfills.js';
 
 /**
@@ -75,6 +80,7 @@ export interface FCPReportCallback extends ReportCallback {
 /**
  * An FCP-specific version of the ReportCallback function with attribution.
  */
-export interface FCPReportCallbackWithAttribution extends FCPReportCallback {
+export interface FCPReportCallbackWithAttribution
+  extends ReportCallbackWithAttribution {
   (metric: FCPMetricWithAttribution): void;
 }
diff --git a/src/types/fid.ts b/src/types/fid.ts
index a5449753..49ddd401 100644
--- a/src/types/fid.ts
+++ b/src/types/fid.ts
@@ -14,7 +14,12 @@
  * limitations under the License.
  */
 
-import {LoadState, Metric, ReportCallback} from './base.js';
+import {
+  LoadState,
+  Metric,
+  ReportCallback,
+  ReportCallbackWithAttribution,
+} from './base.js';
 import {FirstInputPolyfillEntry} from './polyfills.js';
 
 /**
@@ -76,6 +81,7 @@ export interface FIDReportCallback extends ReportCallback {
 /**
  * An FID-specific version of the ReportCallback function with attribution.
  */
-export interface FIDReportCallbackWithAttribution extends FIDReportCallback {
+export interface FIDReportCallbackWithAttribution
+  extends ReportCallbackWithAttribution {
   (metric: FIDMetricWithAttribution): void;
 }
diff --git a/src/types/inp.ts b/src/types/inp.ts
index cc1a0794..ec9c5e76 100644
--- a/src/types/inp.ts
+++ b/src/types/inp.ts
@@ -14,7 +14,12 @@
  * limitations under the License.
  */
 
-import {LoadState, Metric, ReportCallback} from './base.js';
+import {
+  LoadState,
+  Metric,
+  ReportCallback,
+  ReportCallbackWithAttribution,
+} from './base.js';
 
 /**
  * An INP-specific version of the Metric object.
@@ -75,6 +80,7 @@ export interface INPReportCallback extends ReportCallback {
 /**
  * An INP-specific version of the ReportCallback function with attribution.
  */
-export interface INPReportCallbackWithAttribution extends INPReportCallback {
+export interface INPReportCallbackWithAttribution
+  extends ReportCallbackWithAttribution {
   (metric: INPMetricWithAttribution): void;
 }
diff --git a/src/types/lcp.ts b/src/types/lcp.ts
index b2418dbe..4aedd4ff 100644
--- a/src/types/lcp.ts
+++ b/src/types/lcp.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {Metric, ReportCallback} from './base.js';
+import {Metric, ReportCallback, ReportCallbackWithAttribution} from './base.js';
 import {NavigationTimingPolyfillEntry} from './polyfills.js';
 
 /**
@@ -98,6 +98,7 @@ export interface LCPReportCallback extends ReportCallback {
 /**
  * An LCP-specific version of the ReportCallback function with attribution.
  */
-export interface LCPReportCallbackWithAttribution extends LCPReportCallback {
+export interface LCPReportCallbackWithAttribution
+  extends ReportCallbackWithAttribution {
   (metric: LCPMetricWithAttribution): void;
 }
diff --git a/src/types/ttfb.ts b/src/types/ttfb.ts
index 5b7b62b5..66fa23ac 100644
--- a/src/types/ttfb.ts
+++ b/src/types/ttfb.ts
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import {Metric, ReportCallback} from './base.js';
+import {Metric, ReportCallback, ReportCallbackWithAttribution} from './base.js';
 import {NavigationTimingPolyfillEntry} from './polyfills.js';
 
 /**
@@ -76,6 +76,7 @@ export interface TTFBReportCallback extends ReportCallback {
 /**
  * A TTFB-specific version of the ReportCallback function with attribution.
  */
-export interface TTFBReportCallbackWithAttribution extends TTFBReportCallback {
+export interface TTFBReportCallbackWithAttribution
+  extends ReportCallbackWithAttribution {
   (metric: TTFBMetricWithAttribution): void;
 }