diff --git a/android/guava/src/com/google/common/base/Preconditions.java b/android/guava/src/com/google/common/base/Preconditions.java
index 6d00d46ff365..add3288dde39 100644
--- a/android/guava/src/com/google/common/base/Preconditions.java
+++ b/android/guava/src/com/google/common/base/Preconditions.java
@@ -118,6 +118,8 @@
 public final class Preconditions {
   private Preconditions() {}
 
+  private interface Impossible {}
+
   /**
    * Ensures the truth of an expression involving one or more parameters to the calling method.
    *
diff --git a/guava/src/com/google/common/base/Preconditions.java b/guava/src/com/google/common/base/Preconditions.java
index 6d00d46ff365..add3288dde39 100644
--- a/guava/src/com/google/common/base/Preconditions.java
+++ b/guava/src/com/google/common/base/Preconditions.java
@@ -118,6 +118,8 @@
 public final class Preconditions {
   private Preconditions() {}
 
+  private interface Impossible {}
+
   /**
    * Ensures the truth of an expression involving one or more parameters to the calling method.
    *