diff --git a/core/src/main/java/org/apache/accumulo/core/client/rfile/RFileScanner.java b/core/src/main/java/org/apache/accumulo/core/client/rfile/RFileScanner.java
index 638b5104d4e..c5716fa6c84 100644
--- a/core/src/main/java/org/apache/accumulo/core/client/rfile/RFileScanner.java
+++ b/core/src/main/java/org/apache/accumulo/core/client/rfile/RFileScanner.java
@@ -19,7 +19,6 @@
 package org.apache.accumulo.core.client.rfile;
 
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.UncheckedIOException;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -348,13 +347,10 @@ public Iterator<Entry<Key,Value>> iterator() {
 
       for (int i = 0; i < sources.length; i++) {
         // TODO may have been a bug with multiple files and caching in older version...
-        InputStream inputStream = sources[i].getInputStream();
-        if (!(inputStream instanceof FSDataInputStream)) {
-          throw new IllegalArgumentException("Input stream " + i + " is not a FSDataInputStream");
-        }
         CachableBuilder cb = new CachableBuilder()
-            .input((FSDataInputStream) inputStream, "source-" + i).length(sources[i].getLength())
-            .conf(opts.in.getConf()).cacheProvider(cacheProvider).cryptoService(cryptoService);
+            .input((FSDataInputStream) sources[i].getInputStream(), "source-" + i)
+            .length(sources[i].getLength()).conf(opts.in.getConf()).cacheProvider(cacheProvider)
+            .cryptoService(cryptoService);
         readers.add(RFile.getReader(cb, sources[i].getRange()));
       }
 
diff --git a/core/src/main/java/org/apache/accumulo/core/summary/SummaryReader.java b/core/src/main/java/org/apache/accumulo/core/summary/SummaryReader.java
index 1c8848e85ad..2d3bc40df88 100644
--- a/core/src/main/java/org/apache/accumulo/core/summary/SummaryReader.java
+++ b/core/src/main/java/org/apache/accumulo/core/summary/SummaryReader.java
@@ -21,7 +21,6 @@
 import java.io.DataInputStream;
 import java.io.FileNotFoundException;
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.PrintStream;
 import java.io.UncheckedIOException;
 import java.util.ArrayList;
@@ -179,12 +178,9 @@ private static SummaryReader load(CachableBlockFile.Reader bcReader,
   public static SummaryReader load(Configuration conf, RFileSource source, String cacheId,
       Predicate<SummarizerConfiguration> summarySelector, SummarizerFactory factory,
       CryptoService cryptoService) throws IOException {
-    InputStream input = source.getInputStream();
-    if (!(input instanceof FSDataInputStream)) {
-      throw new IllegalArgumentException("Input stream is not a FSDataInputStream");
-    }
-    CachableBuilder cb = new CachableBuilder().input((FSDataInputStream) input, cacheId)
-        .length(source.getLength()).conf(conf).cryptoService(cryptoService);
+    CachableBuilder cb =
+        new CachableBuilder().input((FSDataInputStream) source.getInputStream(), cacheId)
+            .length(source.getLength()).conf(conf).cryptoService(cryptoService);
     return load(new CachableBlockFile.Reader(cb), summarySelector, factory);
   }