diff --git a/com.ibm.wala.dalvik.test/source/com/ibm/wala/dalvik/test/util/Util.java b/com.ibm.wala.dalvik.test/source/com/ibm/wala/dalvik/test/util/Util.java
index 91636caca..cf16e8a69 100644
--- a/com.ibm.wala.dalvik.test/source/com/ibm/wala/dalvik/test/util/Util.java
+++ b/com.ibm.wala.dalvik.test/source/com/ibm/wala/dalvik/test/util/Util.java
@@ -5,7 +5,6 @@ import static com.ibm.wala.properties.WalaProperties.ANDROID_RT_JAVA_JAR;
 
 import java.io.File;
 import java.io.FileFilter;
-import java.io.FilenameFilter;
 import java.io.IOException;
 import java.net.URI;
 import java.util.ArrayList;
@@ -81,7 +80,7 @@ public class Util {
       libs.add(new File(System.getenv("ANDROID_BOOT_OAT")).toURI());
    
     } else if (walaProperties != null && walaProperties.getProperty(ANDROID_RT_DEX_DIR) != null) {
-      for(File lib : new File(walaProperties.getProperty(ANDROID_RT_DEX_DIR)).listFiles((FilenameFilter) (dir, name) -> name.startsWith("boot") && name.endsWith("oat"))) {
+      for(File lib : new File(walaProperties.getProperty(ANDROID_RT_DEX_DIR)).listFiles((dir, name) -> name.startsWith("boot") && name.endsWith("oat"))) {
         libs.add(lib.toURI());
       }
     } else {
diff --git a/com.ibm.wala.shrike/src/com/ibm/wala/shrikeBT/tools/OfflineInstrumenterBase.java b/com.ibm.wala.shrike/src/com/ibm/wala/shrikeBT/tools/OfflineInstrumenterBase.java
index 3f1cb65c8..beb02fc8a 100644
--- a/com.ibm.wala.shrike/src/com/ibm/wala/shrikeBT/tools/OfflineInstrumenterBase.java
+++ b/com.ibm.wala.shrike/src/com/ibm/wala/shrikeBT/tools/OfflineInstrumenterBase.java
@@ -13,7 +13,6 @@ package com.ibm.wala.shrikeBT.tools;
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.File;
-import java.io.FileFilter;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
@@ -263,7 +262,7 @@ public abstract class OfflineInstrumenterBase {
     if (d == null) {
       throw new IllegalArgumentException("d is null");
     }
-    File[] fs = d.listFiles((FileFilter) f -> f.isDirectory() || f.getName().endsWith(".class"));
+    File[] fs = d.listFiles(f -> f.isDirectory() || f.getName().endsWith(".class"));
     if (fs == null) {
       throw new IllegalArgumentException("bad directory " + d.getAbsolutePath());
     }
diff --git a/com.ibm.wala.util/src/com/ibm/wala/util/io/FileUtil.java b/com.ibm.wala.util/src/com/ibm/wala/util/io/FileUtil.java
index 3cee37f2e..55321893f 100644
--- a/com.ibm.wala.util/src/com/ibm/wala/util/io/FileUtil.java
+++ b/com.ibm.wala.util/src/com/ibm/wala/util/io/FileUtil.java
@@ -11,7 +11,6 @@ package com.ibm.wala.util.io;
 
 import java.io.ByteArrayOutputStream;
 import java.io.File;
-import java.io.FileFilter;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.IOException;
@@ -192,7 +191,7 @@ public class FileUtil {
 
   public static void recurseFiles(Consumer<File> action, final Predicate<File> filter, File top) {
   	if (top.isDirectory()) {
-  		for(File f : top.listFiles((FileFilter) file -> filter.test(file) || file.isDirectory())) {
+  		for(File f : top.listFiles(file -> filter.test(file) || file.isDirectory())) {
   			recurseFiles(action, filter, f);
   		}
   	} else {