diff --git a/runtime/well_known_classes.cc b/runtime/well_known_classes.cc
index 8300921..cfa8329 100644
--- a/runtime/well_known_classes.cc
+++ b/runtime/well_known_classes.cc
@@ -129,6 +129,7 @@
 jmethodID WellKnownClasses::org_apache_harmony_dalvik_ddmc_DdmServer_dispatch;
 
 jfieldID WellKnownClasses::dalvik_system_DexFile_cookie;
+jfieldID WellKnownClasses::dalvik_system_DexFile_fileName;
 jfieldID WellKnownClasses::dalvik_system_PathClassLoader_pathList;
 jfieldID WellKnownClasses::dalvik_system_DexPathList_dexElements;
 jfieldID WellKnownClasses::dalvik_system_DexPathList__Element_dexFile;
@@ -333,6 +334,7 @@
        true, "newStringFromStringBuilder", "(Ljava/lang/StringBuilder;)Ljava/lang/String;");
 
   dalvik_system_DexFile_cookie = CacheField(env, dalvik_system_DexFile, false, "mCookie", "Ljava/lang/Object;");
+  dalvik_system_DexFile_fileName = CacheField(env, dalvik_system_DexFile, false, "mFileName", "Ljava/lang/String;");
   dalvik_system_PathClassLoader_pathList = CacheField(env, dalvik_system_PathClassLoader, false, "pathList", "Ldalvik/system/DexPathList;");
   dalvik_system_DexPathList_dexElements = CacheField(env, dalvik_system_DexPathList, false, "dexElements", "[Ldalvik/system/DexPathList$Element;");
   dalvik_system_DexPathList__Element_dexFile = CacheField(env, dalvik_system_DexPathList__Element, false, "dexFile", "Ldalvik/system/DexFile;");