diff --git a/service/src/com/android/server/connectivity/PermissionMonitor.java b/service/src/com/android/server/connectivity/PermissionMonitor.java
index 512d76772d..56b2e6d2d8 100755
--- a/service/src/com/android/server/connectivity/PermissionMonitor.java
+++ b/service/src/com/android/server/connectivity/PermissionMonitor.java
@@ -153,7 +153,7 @@ public class PermissionMonitor {
          * Get device first sdk version.
          */
         public int getDeviceFirstSdkInt() {
-            return Build.VERSION.FIRST_SDK_INT;
+            return Build.VERSION.DEVICE_INITIAL_SDK_INT;
         }
 
         /**
diff --git a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
index e45aa982cf..a2676999d9 100644
--- a/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
+++ b/tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java
@@ -159,6 +159,7 @@ import androidx.test.InstrumentationRegistry;
 import androidx.test.runner.AndroidJUnit4;
 
 import com.android.internal.util.ArrayUtils;
+import com.android.modules.utils.build.SdkLevel;
 import com.android.networkstack.apishim.ConnectivityManagerShimImpl;
 import com.android.networkstack.apishim.ConstantsShim;
 import com.android.networkstack.apishim.NetworkInformationShimImpl;
@@ -1698,7 +1699,10 @@ public class ConnectivityManagerTest {
             return;
         }
 
-        final int firstSdk = Build.VERSION.FIRST_SDK_INT;
+        final int firstSdk = SdkLevel.isAtLeastS()
+                ? Build.VERSION.DEVICE_INITIAL_SDK_INT
+                // FIRST_SDK_INT was a @TestApi field renamed to DEVICE_INITIAL_SDK_INT in S
+                : Build.VERSION.class.getField("FIRST_SDK_INT").getInt(null);
         if (firstSdk < Build.VERSION_CODES.Q) {
             Log.i(TAG, "testSocketKeepaliveLimitTelephony: skip test for devices launching"
                     + " before Q: " + firstSdk);
diff --git a/tests/unit/java/android/net/IpSecAlgorithmTest.java b/tests/unit/java/android/net/IpSecAlgorithmTest.java
index cac8c2d941..c2a759b83a 100644
--- a/tests/unit/java/android/net/IpSecAlgorithmTest.java
+++ b/tests/unit/java/android/net/IpSecAlgorithmTest.java
@@ -123,7 +123,7 @@ public class IpSecAlgorithmTest {
 
     @Test
     public void testValidationForAlgosAddedInS() throws Exception {
-        if (Build.VERSION.FIRST_SDK_INT <= Build.VERSION_CODES.R) {
+        if (Build.VERSION.DEVICE_INITIAL_SDK_INT <= Build.VERSION_CODES.R) {
             return;
         }
 
@@ -196,13 +196,13 @@ public class IpSecAlgorithmTest {
     private static Set<String> getMandatoryAlgos() {
         return CollectionUtils.filter(
                 ALGO_TO_REQUIRED_FIRST_SDK.keySet(),
-                i -> Build.VERSION.FIRST_SDK_INT >= ALGO_TO_REQUIRED_FIRST_SDK.get(i));
+                i -> Build.VERSION.DEVICE_INITIAL_SDK_INT >= ALGO_TO_REQUIRED_FIRST_SDK.get(i));
     }
 
     private static Set<String> getOptionalAlgos() {
         return CollectionUtils.filter(
                 ALGO_TO_REQUIRED_FIRST_SDK.keySet(),
-                i -> Build.VERSION.FIRST_SDK_INT < ALGO_TO_REQUIRED_FIRST_SDK.get(i));
+                i -> Build.VERSION.DEVICE_INITIAL_SDK_INT < ALGO_TO_REQUIRED_FIRST_SDK.get(i));
     }
 
     @Test