diff --git a/android/guava/src/com/google/common/io/BaseEncoding.java b/android/guava/src/com/google/common/io/BaseEncoding.java
index 86a19493bbcf..9b64fb8c1c9b 100644
--- a/android/guava/src/com/google/common/io/BaseEncoding.java
+++ b/android/guava/src/com/google/common/io/BaseEncoding.java
@@ -28,6 +28,7 @@
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.base.Ascii;
 import com.google.common.base.Objects;
+import com.google.errorprone.annotations.concurrent.LazyInit;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -831,8 +832,8 @@ public BaseEncoding withSeparator(String separator, int afterEveryChars) {
       return new SeparatedBaseEncoding(this, separator, afterEveryChars);
     }
 
-    @MonotonicNonNullDecl private transient BaseEncoding upperCase;
-    @MonotonicNonNullDecl private transient BaseEncoding lowerCase;
+    @LazyInit @MonotonicNonNullDecl private transient BaseEncoding upperCase;
+    @LazyInit @MonotonicNonNullDecl private transient BaseEncoding lowerCase;
 
     @Override
     public BaseEncoding upperCase() {
diff --git a/guava/src/com/google/common/io/BaseEncoding.java b/guava/src/com/google/common/io/BaseEncoding.java
index f3b3983169ab..408a21dd7b3a 100644
--- a/guava/src/com/google/common/io/BaseEncoding.java
+++ b/guava/src/com/google/common/io/BaseEncoding.java
@@ -28,6 +28,7 @@
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.base.Ascii;
 import com.google.common.base.Objects;
+import com.google.errorprone.annotations.concurrent.LazyInit;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
@@ -831,8 +832,8 @@ public BaseEncoding withSeparator(String separator, int afterEveryChars) {
       return new SeparatedBaseEncoding(this, separator, afterEveryChars);
     }
 
-    private transient @MonotonicNonNull BaseEncoding upperCase;
-    private transient @MonotonicNonNull BaseEncoding lowerCase;
+    @LazyInit @MonotonicNonNull private transient BaseEncoding upperCase;
+    @LazyInit @MonotonicNonNull private transient BaseEncoding lowerCase;
 
     @Override
     public BaseEncoding upperCase() {