diff --git a/sdk/lib/io/common.dart b/sdk/lib/io/common.dart
index e6b5547ea25..dd45dbda2f4 100644
--- a/sdk/lib/io/common.dart
+++ b/sdk/lib/io/common.dart
@@ -52,7 +52,7 @@ abstract class IOException implements Exception {
   * operating system.
   */
 @pragma("vm:entry-point")
-class OSError {
+class OSError implements Exception {
   /** Constant used to indicate that no OS error code is available. */
   static const int noErrorCode = -1;
 
diff --git a/sdk_nnbd/lib/io/common.dart b/sdk_nnbd/lib/io/common.dart
index e6a56bc2cab..dd4e46f1ded 100644
--- a/sdk_nnbd/lib/io/common.dart
+++ b/sdk_nnbd/lib/io/common.dart
@@ -50,7 +50,7 @@ abstract class IOException implements Exception {
   * operating system.
   */
 @pragma("vm:entry-point")
-class OSError {
+class OSError implements Exception {
   /** Constant used to indicate that no OS error code is available. */
   static const int noErrorCode = -1;