diff --git a/src/main/java/dan200/computercraft/core/apis/handles/BinaryReadableHandle.java b/src/main/java/dan200/computercraft/core/apis/handles/BinaryReadableHandle.java
index 45f36eaca..9a1911cb3 100644
--- a/src/main/java/dan200/computercraft/core/apis/handles/BinaryReadableHandle.java
+++ b/src/main/java/dan200/computercraft/core/apis/handles/BinaryReadableHandle.java
@@ -14,6 +14,7 @@ import javax.annotation.Nonnull;
 import java.io.ByteArrayOutputStream;
 import java.io.Closeable;
 import java.io.IOException;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.channels.ReadableByteChannel;
 import java.nio.channels.SeekableByteChannel;
@@ -124,7 +125,7 @@ public class BinaryReadableHandle extends HandleGeneric
                     }
                     else
                     {
-                        single.clear();
+                        ((Buffer) single).clear();
                         int b = m_reader.read( single );
                         return b == -1 ? null : new Object[] { single.get( 0 ) & 0xFF };
                     }
@@ -148,7 +149,7 @@ public class BinaryReadableHandle extends HandleGeneric
                     boolean readAnything = false;
                     while( true )
                     {
-                        buf.clear();
+                        ((Buffer) buf).clear();
                         int r = m_reader.read( buf );
                         if( r == -1 ) break;
 
@@ -172,7 +173,7 @@ public class BinaryReadableHandle extends HandleGeneric
                     boolean readAnything = false, readRc = false;
                     while( true )
                     {
-                        single.clear();
+                        ((Buffer) single).clear();
                         int read = m_reader.read( single );
                         if( read <= 0 )
                         {
diff --git a/src/main/java/dan200/computercraft/core/apis/handles/BinaryWritableHandle.java b/src/main/java/dan200/computercraft/core/apis/handles/BinaryWritableHandle.java
index 7d78411d3..4501436da 100644
--- a/src/main/java/dan200/computercraft/core/apis/handles/BinaryWritableHandle.java
+++ b/src/main/java/dan200/computercraft/core/apis/handles/BinaryWritableHandle.java
@@ -15,6 +15,7 @@ import dan200.computercraft.shared.util.StringUtil;
 import javax.annotation.Nonnull;
 import java.io.Closeable;
 import java.io.IOException;
+import java.nio.Buffer;
 import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
 import java.nio.channels.SeekableByteChannel;
@@ -60,7 +61,7 @@ public class BinaryWritableHandle extends HandleGeneric
                     if( args.length > 0 && args[0] instanceof Number )
                     {
                         int number = ((Number) args[0]).intValue();
-                        single.clear();
+                        ((Buffer) single).clear();
                         single.put( (byte) number );
                         single.flip();