diff --git a/core/api/module-lib-current.txt b/core/api/module-lib-current.txt
index 67eee6253235a..bc4a3ca8b2447 100644
--- a/core/api/module-lib-current.txt
+++ b/core/api/module-lib-current.txt
@@ -52,6 +52,10 @@ package android.os {
     method public final void markVintfStability();
   }
 
+  public static class Build.VERSION {
+    field public static final int FIRST_SDK_INT;
+  }
+
   public interface Parcelable {
     method public default int getStability();
   }
diff --git a/core/java/android/os/Build.java b/core/java/android/os/Build.java
index 0d8769e7635c2..10761187d9699 100755
--- a/core/java/android/os/Build.java
+++ b/core/java/android/os/Build.java
@@ -317,6 +317,7 @@ public class Build {
          * @see #SDK_INT
          * @hide
          */
+        @SystemApi(client = SystemApi.Client.MODULE_LIBRARIES)
         @TestApi
         public static final int FIRST_SDK_INT = SystemProperties
                 .getInt("ro.product.first_api_level", 0);