diff --git a/src/vm/jvm/QAST/Compiler.nqp b/src/vm/jvm/QAST/Compiler.nqp
index 1f698480b7..5c5eef49f9 100644
--- a/src/vm/jvm/QAST/Compiler.nqp
+++ b/src/vm/jvm/QAST/Compiler.nqp
@@ -2077,8 +2077,6 @@ QAST::OperationsJAST.map_classlib_core_op('eoffh', $TYPE_OPS, 'eoffh', [$RT_OBJ]
 QAST::OperationsJAST.map_classlib_core_op('closefh', $TYPE_OPS, 'closefh', [$RT_OBJ], $RT_OBJ, :tc);
 QAST::OperationsJAST.map_classlib_core_op('closefh_i', $TYPE_OPS, 'closefhi', [$RT_OBJ], $RT_INT, :tc);
 
-QAST::OperationsJAST.map_classlib_core_op('isttyfh', $TYPE_OPS, 'isttyfh', [$RT_OBJ], $RT_INT, :tc);
-
 QAST::OperationsJAST.map_classlib_core_op('chmod', $TYPE_OPS, 'chmod', [$RT_STR, $RT_INT], $RT_INT, :tc);
 QAST::OperationsJAST.map_classlib_core_op('unlink', $TYPE_OPS, 'unlink', [$RT_STR], $RT_INT, :tc);
 QAST::OperationsJAST.map_classlib_core_op('rmdir', $TYPE_OPS, 'rmdir', [$RT_STR], $RT_INT, :tc);
diff --git a/src/vm/jvm/runtime/org/perl6/nqp/io/StandardReadHandle.java b/src/vm/jvm/runtime/org/perl6/nqp/io/StandardReadHandle.java
index e0ae4233b5..d3fb726e03 100644
--- a/src/vm/jvm/runtime/org/perl6/nqp/io/StandardReadHandle.java
+++ b/src/vm/jvm/runtime/org/perl6/nqp/io/StandardReadHandle.java
@@ -12,7 +12,7 @@
 import org.perl6.nqp.runtime.ExceptionHandling;
 import org.perl6.nqp.runtime.ThreadContext;
 
-public class StandardReadHandle implements IIOClosable, IIOEncodable, IIOSyncReadable, IIOInteractive, IIOPossiblyTTY {
+public class StandardReadHandle implements IIOClosable, IIOEncodable, IIOSyncReadable, IIOInteractive {
     private InputStream is;
     private BufferedReader br;
     private ConsoleReader cr;
@@ -118,8 +118,4 @@ public synchronized String readlineInteractive(ThreadContext tc, String prompt)
     public boolean eof(ThreadContext tc) {
         return eof;
     }
-
-    public boolean isTTY(ThreadContext tc) {
-        return System.console() != null;
-    }
 }
diff --git a/src/vm/jvm/runtime/org/perl6/nqp/io/StandardWriteHandle.java b/src/vm/jvm/runtime/org/perl6/nqp/io/StandardWriteHandle.java
index 2a40e6981e..cd57478baa 100644
--- a/src/vm/jvm/runtime/org/perl6/nqp/io/StandardWriteHandle.java
+++ b/src/vm/jvm/runtime/org/perl6/nqp/io/StandardWriteHandle.java
@@ -11,7 +11,7 @@
 import org.perl6.nqp.runtime.ExceptionHandling;
 import org.perl6.nqp.runtime.ThreadContext;
 
-public class StandardWriteHandle implements IIOClosable, IIOSeekable, IIOEncodable, IIOSyncWritable, IIOPossiblyTTY {
+public class StandardWriteHandle implements IIOClosable, IIOSeekable, IIOEncodable, IIOSyncWritable {
     private PrintStream ps;
     private CharsetEncoder enc;
     private CharsetDecoder dec;
@@ -65,8 +65,4 @@ public long say(ThreadContext tc, String s) {
     public void flush(ThreadContext tc) {
         ps.flush();
     }
-
-    public boolean isTTY(ThreadContext tc) {
-        return System.console() != null;
-    }
 }
diff --git a/src/vm/jvm/runtime/org/perl6/nqp/runtime/Ops.java b/src/vm/jvm/runtime/org/perl6/nqp/runtime/Ops.java
index ab9c59afbe..6a0d1a0875 100644
--- a/src/vm/jvm/runtime/org/perl6/nqp/runtime/Ops.java
+++ b/src/vm/jvm/runtime/org/perl6/nqp/runtime/Ops.java
@@ -60,7 +60,6 @@
 import org.perl6.nqp.io.IIOSeekable;
 import org.perl6.nqp.io.IIOSyncReadable;
 import org.perl6.nqp.io.IIOSyncWritable;
-import org.perl6.nqp.io.IIOPossiblyTTY;
 import org.perl6.nqp.io.ProcessHandle;
 import org.perl6.nqp.io.ProcessChannel;
 import org.perl6.nqp.io.ServerSocketHandle;
@@ -814,20 +813,6 @@ public static long closefhi(SixModelObject obj, ThreadContext tc) {
         return -1;
     }
 
-    public static long isttyfh(SixModelObject obj, ThreadContext tc) {
-        if (obj instanceof IOHandleInstance) {
-            IOHandleInstance h = (IOHandleInstance)obj;
-            if (h.handle instanceof IIOPossiblyTTY)
-                return ((IIOPossiblyTTY)h.handle).isTTY(tc) ? 1 : 0;
-            else
-                return 0;
-        }
-        else {
-            die_s("isttyfh requires an object with the IOHandle REPR", tc);
-        }
-        return -1;
-    }
-
     public static Set<PosixFilePermission> modeToPosixFilePermission(long mode) {
         Set<PosixFilePermission> perms = EnumSet.noneOf(PosixFilePermission.class);
         if ((mode & 0001) != 0) perms.add(PosixFilePermission.OTHERS_EXECUTE);