diff --git a/pwndbg/color.py b/pwndbg/color.py
index 4d0fc892b..391b0e188 100644
--- a/pwndbg/color.py
+++ b/pwndbg/color.py
@@ -3,6 +3,8 @@ from __future__ import unicode_literals
 
 import functools
 
+import six
+
 import gdb
 import pwndbg.config
 import pwndbg.enhance
@@ -93,7 +95,7 @@ def get(address, text = None):
         old_color = color
         color = lambda x: rwx(old_color(x))
 
-    if text is None and isinstance(address, (long, int)) and address > 255:
+    if text is None and isinstance(address, six.integer_types) and address > 255:
         text = hex(int(address))
     if text is None:
         text = str(int(address))
diff --git a/pwndbg/commands/auxv.py b/pwndbg/commands/auxv.py
index e3151e4d5..ddf4641bb 100644
--- a/pwndbg/commands/auxv.py
+++ b/pwndbg/commands/auxv.py
@@ -1,6 +1,8 @@
 from __future__ import print_function
 from __future__ import unicode_literals
 
+import six
+
 import gdb
 import pwndbg.auxv
 import pwndbg.chain
@@ -15,4 +17,4 @@ def auxv():
     """
     for k,v in sorted(pwndbg.auxv.get().items()):
         if v is not None:
-            print(k.ljust(24), v if not isinstance(v, (long, int)) else pwndbg.chain.format(v))
+            print(k.ljust(24), v if not isinstance(v, six.integer_types) else pwndbg.chain.format(v))
diff --git a/pwndbg/commands/heap.py b/pwndbg/commands/heap.py
index 6bea9a8cd..ca0501a68 100644
--- a/pwndbg/commands/heap.py
+++ b/pwndbg/commands/heap.py
@@ -1,8 +1,9 @@
 #!/usr/bin/env python
-
 from __future__ import print_function
 from __future__ import unicode_literals
 
+import six
+
 import gdb
 import pwndbg.commands
 from pwndbg.color import bold
@@ -152,7 +153,7 @@ def malloc_chunk(addr):
     """
     Prints out the malloc_chunk at the specified address.
     """
-    if not isinstance(addr, int):
+    if not isinstance(addr, six.integer_types):
         addr = int(addr)
 
     chunk = value_from_type('struct malloc_chunk', addr)
diff --git a/pwndbg/commands/vmmap.py b/pwndbg/commands/vmmap.py
index 18f41570c..a05f5a8a1 100644
--- a/pwndbg/commands/vmmap.py
+++ b/pwndbg/commands/vmmap.py
@@ -6,6 +6,8 @@ Command to print the vitual memory map a la /proc/self/maps.
 from __future__ import print_function
 from __future__ import unicode_literals
 
+import six
+
 import gdb
 import pwndbg.color
 import pwndbg.commands
@@ -24,9 +26,9 @@ def vmmap(map=None):
     int_map = None
     str_map = None
 
-    if isinstance(map, pwndbg.compat.basestring):
+    if isinstance(map, six.string_types):
         str_map = map
-    elif isinstance(map, (long, int, gdb.Value)):
+    elif isinstance(map, six.integer_types + (gdb.Value,)):
         int_map = int(map)
 
     print(pwndbg.color.legend())
diff --git a/pwndbg/regs.py b/pwndbg/regs.py
index f0bf23081..f261052db 100644
--- a/pwndbg/regs.py
+++ b/pwndbg/regs.py
@@ -13,6 +13,8 @@ import re
 import sys
 from types import ModuleType
 
+import six
+
 import gdb
 import pwndbg.arch
 import pwndbg.compat
@@ -282,10 +284,10 @@ class module(ModuleType):
 
     @pwndbg.memoize.reset_on_stop
     def __getitem__(self, item):
-        if isinstance(item, int):
+        if isinstance(item, six.integer_types):
             return arch_to_regs[pwndbg.arch.current][item]
 
-        if not isinstance(item, pwndbg.compat.basestring):
+        if not isinstance(item, six.string_types):
             print("Unknown register type: %r" % (item))
             import pdb, traceback
             traceback.print_stack()
@@ -296,7 +298,7 @@ class module(ModuleType):
         item = item.lstrip('$')
         item = getattr(self, item.lower())
 
-        if isinstance(item, (int,long)):
+        if isinstance(item, six.integer_types):
             return int(item) & pwndbg.arch.ptrmask
 
         return item
diff --git a/pwndbg/symbol.py b/pwndbg/symbol.py
index 4bb8ec903..0abca672a 100644
--- a/pwndbg/symbol.py
+++ b/pwndbg/symbol.py
@@ -18,6 +18,7 @@ import elftools.common.exceptions
 import elftools.elf.constants
 import elftools.elf.elffile
 import elftools.elf.segments
+import six
 
 import gdb
 import pwndbg.elf
@@ -190,7 +191,7 @@ def get(address, gdb_only=False):
 
 @pwndbg.memoize.reset_on_objfile
 def address(symbol):
-    if isinstance(symbol, (int,long)):
+    if isinstance(symbol, six.integer_types):
         return symbol
 
     try:
diff --git a/pwndbg/typeinfo.py b/pwndbg/typeinfo.py
index a03991402..69023920e 100644
--- a/pwndbg/typeinfo.py
+++ b/pwndbg/typeinfo.py
@@ -13,6 +13,8 @@ import subprocess
 import sys
 import tempfile
 
+import six
+
 import gdb
 import pwndbg.events
 import pwndbg.gcc