diff --git a/core/java/com/android/internal/os/Zygote.java b/core/java/com/android/internal/os/Zygote.java
index c5fa0a1..54c532a 100644
--- a/core/java/com/android/internal/os/Zygote.java
+++ b/core/java/com/android/internal/os/Zygote.java
@@ -18,8 +18,8 @@
 
 
 import dalvik.system.ZygoteHooks;
-import libcore.io.ErrnoException;
-import libcore.io.Libcore;
+import android.system.ErrnoException;
+import android.system.Os;
 
 /** @hide */
 public final class Zygote {
@@ -141,7 +141,7 @@
     public static void execShell(String command) {
         String[] args = { "/system/bin/sh", "-c", command };
         try {
-            Libcore.os.execv(args[0], args);
+            Os.execv(args[0], args);
         } catch (ErrnoException e) {
             throw new RuntimeException(e);
         }
diff --git a/core/java/com/android/internal/os/ZygoteConnection.java b/core/java/com/android/internal/os/ZygoteConnection.java
index 58a8e62..0c48368 100644
--- a/core/java/com/android/internal/os/ZygoteConnection.java
+++ b/core/java/com/android/internal/os/ZygoteConnection.java
@@ -21,6 +21,8 @@
 import android.os.Process;
 import android.os.SELinux;
 import android.os.SystemProperties;
+import android.system.ErrnoException;
+import android.system.Os;
 import android.util.Log;
 import dalvik.system.PathClassLoader;
 import java.io.BufferedReader;
@@ -34,9 +36,7 @@
 import java.io.PrintStream;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
-import libcore.io.ErrnoException;
 import libcore.io.IoUtils;
-import libcore.io.Libcore;
 
 /**
  * A connection that can make spawn requests.
@@ -186,7 +186,7 @@
             }
 
             if (parsedArgs.runtimeInit && parsedArgs.invokeWith != null) {
-                FileDescriptor[] pipeFds = Libcore.os.pipe();
+                FileDescriptor[] pipeFds = Os.pipe();
                 childPipeFd = pipeFds[1];
                 serverPipeFd = pipeFds[0];
                 ZygoteInit.setCloseOnExec(serverPipeFd, true);
diff --git a/core/java/com/android/internal/os/ZygoteInit.java b/core/java/com/android/internal/os/ZygoteInit.java
index 3f5ad86..1a83bce 100644
--- a/core/java/com/android/internal/os/ZygoteInit.java
+++ b/core/java/com/android/internal/os/ZygoteInit.java
@@ -28,14 +28,14 @@
 import android.os.SystemClock;
 import android.os.SystemProperties;
 import android.os.Trace;
+import android.system.Os;
+import android.system.OsConstants;
 import android.util.EventLog;
 import android.util.Log;
 
 import dalvik.system.VMRuntime;
 
 import libcore.io.IoUtils;
-import libcore.io.Libcore;
-import libcore.io.OsConstants;
 
 import java.io.BufferedReader;
 import java.io.FileDescriptor;
@@ -473,7 +473,7 @@
         closeServerSocket();
 
         // set umask to 0077 so new files and directories will default to owner-only permissions.
-        Libcore.os.umask(S_IRWXG | S_IRWXO);
+        Os.umask(S_IRWXG | S_IRWXO);
 
         if (parsedArgs.niceName != null) {
             Process.setArgV0(parsedArgs.niceName);