diff --git a/src/library_desugar/desugar_jdk_libs.json b/src/library_desugar/desugar_jdk_libs.json
index 98ceb80..ed216b0 100644
--- a/src/library_desugar/desugar_jdk_libs.json
+++ b/src/library_desugar/desugar_jdk_libs.json
@@ -2,7 +2,7 @@
   "configuration_format_version": 3,
   "group_id" : "com.tools.android",
   "artifact_id" : "desugar_jdk_libs",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "required_compilation_api_level": 26,
   "synthesized_library_classes_package_prefix": "j$.",
   "support_all_callbacks_from_library": true,
@@ -243,7 +243,7 @@
     "-keepclassmembers class j$.util.concurrent.ConcurrentHashMap$TreeBin { int lockState; }",
     "-keepclassmembers class j$.util.concurrent.ConcurrentHashMap { int sizeCtl; int transferIndex; long baseCount; int cellsBusy; }",
     "-keepclassmembers class j$.util.concurrent.ConcurrentHashMap$CounterCell { long value; }",
-    "-keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String); }",
+    "-keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String); public static final !synthetic <fields>; }",
     "-keeppackagenames j$",
     "-keepclassmembers class j$.util.IntSummaryStatistics { long count; long sum; int min; int max; }",
     "-keepclassmembers class j$.util.LongSummaryStatistics { long count; long sum; long min; long max; }",
diff --git a/src/library_desugar/desugar_jdk_libs_alternative_3.json b/src/library_desugar/desugar_jdk_libs_alternative_3.json
index 628fc53..012d6ce 100644
--- a/src/library_desugar/desugar_jdk_libs_alternative_3.json
+++ b/src/library_desugar/desugar_jdk_libs_alternative_3.json
@@ -2,7 +2,7 @@
   "configuration_format_version": 3,
   "group_id" : "com.tools.android",
   "artifact_id" : "desugar_jdk_libs_alternative_3",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "required_compilation_api_level": 26,
   "synthesized_library_classes_package_prefix": "j$.",
   "support_all_callbacks_from_library": false,
@@ -246,7 +246,7 @@
     "-keepclassmembers class j$.util.concurrent.ConcurrentHashMap$TreeBin { int lockState; }",
     "-keepclassmembers class j$.util.concurrent.ConcurrentHashMap { int sizeCtl; int transferIndex; long baseCount; int cellsBusy; }",
     "-keepclassmembers class j$.util.concurrent.ConcurrentHashMap$CounterCell { long value; }",
-    "-keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String); }",
+    "-keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String); public static final !synthetic <fields>; }",
     "-keeppackagenames j$",
     "-keepclassmembers class j$.util.IntSummaryStatistics { long count; long sum; int min; int max; }",
     "-keepclassmembers class j$.util.LongSummaryStatistics { long count; long sum; long min; long max; }",
diff --git a/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/gson/GsonEnumTest.java b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/gson/GsonEnumTest.java
new file mode 100644
index 0000000..d71b536
--- /dev/null
+++ b/src/test/java/com/android/tools/r8/desugar/desugaredlibrary/gson/GsonEnumTest.java
@@ -0,0 +1,80 @@
+// Copyright (c) 2020, the R8 project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+package com.android.tools.r8.desugar.desugaredlibrary.gson;
+
+import com.android.tools.r8.TestParameters;
+import com.android.tools.r8.desugar.desugaredlibrary.DesugaredLibraryTestBase;
+import com.android.tools.r8.utils.BooleanUtils;
+import java.lang.reflect.Field;
+import java.time.chrono.IsoEra;
+import java.util.List;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+@RunWith(Parameterized.class)
+public class GsonEnumTest extends DesugaredLibraryTestBase {
+
+  private final TestParameters parameters;
+  private final boolean shrinkDesugaredLibrary;
+
+  @Parameters(name = "{1}, shrinkDesugaredLibrary: {0}")
+  public static List<Object[]> data() {
+    return buildParameters(
+        BooleanUtils.values(), getTestParameters().withDexRuntimes().withAllApiLevels().build());
+  }
+
+  public GsonEnumTest(boolean shrinkDesugaredLibrary, TestParameters parameters) {
+    this.shrinkDesugaredLibrary = shrinkDesugaredLibrary;
+    this.parameters = parameters;
+  }
+
+  @Test
+  public void testCustomCollectionD8() throws Exception {
+    KeepRuleConsumer keepRuleConsumer = createKeepRuleConsumer(parameters);
+    testForD8()
+        .addInnerClasses(GsonEnumTest.class)
+        .setMinApi(parameters.getApiLevel())
+        .enableCoreLibraryDesugaring(parameters.getApiLevel(), keepRuleConsumer)
+        .compile()
+        .addDesugaredCoreLibraryRunClassPath(
+            this::buildDesugaredLibrary,
+            parameters.getApiLevel(),
+            keepRuleConsumer.get(),
+            shrinkDesugaredLibrary)
+        .run(parameters.getRuntime(), Executor.class)
+        .assertSuccessWithOutputLines("0");
+  }
+
+  @Test
+  public void testCustomCollectionR8() throws Exception {
+    KeepRuleConsumer keepRuleConsumer = createKeepRuleConsumer(parameters);
+    testForR8(Backend.DEX)
+        .addInnerClasses(GsonEnumTest.class)
+        .addKeepMainRule(Executor.class)
+        .noMinification()
+        .setMinApi(parameters.getApiLevel())
+        .enableCoreLibraryDesugaring(parameters.getApiLevel(), keepRuleConsumer)
+        .compile()
+        .addDesugaredCoreLibraryRunClassPath(
+            this::buildDesugaredLibrary,
+            parameters.getApiLevel(),
+            keepRuleConsumer.get(),
+            shrinkDesugaredLibrary)
+        .run(parameters.getRuntime(), Executor.class)
+        .assertSuccessWithOutputLines("0");
+  }
+
+  @SuppressWarnings("MismatchedQueryAndUpdateOfCollection")
+  static class Executor {
+    public static void main(String[] args) throws NoSuchFieldException, IllegalAccessException {
+      // For GSON to correctly serialize enums, it needs to be able to access all of the static
+      // enum fields.
+      Field bce = IsoEra.class.getField("BCE");
+      System.out.println(((IsoEra) bce.get(null)).ordinal());
+    }
+  }
+}