diff --git a/dexlib2/src/main/java/org/jf/dexlib2/analysis/ClassProto.java b/dexlib2/src/main/java/org/jf/dexlib2/analysis/ClassProto.java
index b1c10d2c..0f8728e1 100644
--- a/dexlib2/src/main/java/org/jf/dexlib2/analysis/ClassProto.java
+++ b/dexlib2/src/main/java/org/jf/dexlib2/analysis/ClassProto.java
@@ -31,9 +31,7 @@
 
 package org.jf.dexlib2.analysis;
 
-import com.google.common.base.Predicates;
-import com.google.common.base.Supplier;
-import com.google.common.base.Suppliers;
+import com.google.common.base.*;
 import com.google.common.collect.*;
 import com.google.common.primitives.Ints;
 import org.jf.dexlib2.AccessFlags;
@@ -219,7 +217,7 @@ public class ClassProto implements TypeProto {
 
         if (!interfacesFullyResolved) {
             throw new UnresolvedClassException("Interfaces for class %s not fully resolved: %s", getType(),
-                    String.join(",", getUnresolvedInterfaces()));
+                    Joiner.on(",").join(getUnresolvedInterfaces()));
         }
 
         return directInterfaces;