diff --git a/api/current.txt b/api/current.txt
index ecdbcd2e56b5c..94e90a75f644d 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -36675,7 +36675,7 @@ package android.os {
     method public int dataCapacity();
     method public int dataPosition();
     method public int dataSize();
-    method public void enforceInterface(String);
+    method public void enforceInterface(@NonNull String);
     method public boolean hasFileDescriptors();
     method public byte[] marshall();
     method @NonNull public static android.os.Parcel obtain();
@@ -36746,7 +36746,7 @@ package android.os {
     method public void writeFloatArray(@Nullable float[]);
     method public void writeInt(int);
     method public void writeIntArray(@Nullable int[]);
-    method public void writeInterfaceToken(String);
+    method public void writeInterfaceToken(@NonNull String);
     method public void writeList(@Nullable java.util.List);
     method public void writeLong(long);
     method public void writeLongArray(@Nullable long[]);
diff --git a/core/java/android/os/Parcel.java b/core/java/android/os/Parcel.java
index 1bddc49f839ce..13d5f6a9c9d7e 100644
--- a/core/java/android/os/Parcel.java
+++ b/core/java/android/os/Parcel.java
@@ -673,11 +673,11 @@ public final class Parcel {
      * {@link #dataPosition}.  This is used to validate that the marshalled
      * transaction is intended for the target interface.
      */
-    public final void writeInterfaceToken(String interfaceName) {
+    public final void writeInterfaceToken(@NonNull String interfaceName) {
         nativeWriteInterfaceToken(mNativePtr, interfaceName);
     }
 
-    public final void enforceInterface(String interfaceName) {
+    public final void enforceInterface(@NonNull String interfaceName) {
         nativeEnforceInterface(mNativePtr, interfaceName);
     }
 
diff --git a/non-updatable-api/current.txt b/non-updatable-api/current.txt
index 008f74f9cf68b..983f20aad2e3a 100644
--- a/non-updatable-api/current.txt
+++ b/non-updatable-api/current.txt
@@ -35210,7 +35210,7 @@ package android.os {
     method public int dataCapacity();
     method public int dataPosition();
     method public int dataSize();
-    method public void enforceInterface(String);
+    method public void enforceInterface(@NonNull String);
     method public boolean hasFileDescriptors();
     method public byte[] marshall();
     method @NonNull public static android.os.Parcel obtain();
@@ -35281,7 +35281,7 @@ package android.os {
     method public void writeFloatArray(@Nullable float[]);
     method public void writeInt(int);
     method public void writeIntArray(@Nullable int[]);
-    method public void writeInterfaceToken(String);
+    method public void writeInterfaceToken(@NonNull String);
     method public void writeList(@Nullable java.util.List);
     method public void writeLong(long);
     method public void writeLongArray(@Nullable long[]);