diff --git a/volatility/framework/symbols/windows/extensions/__init__.py b/volatility/framework/symbols/windows/extensions/__init__.py
index 9aeb042c8..5452a5e6f 100644
--- a/volatility/framework/symbols/windows/extensions/__init__.py
+++ b/volatility/framework/symbols/windows/extensions/__init__.py
@@ -82,7 +82,7 @@ class _MMVAD_SHORT(objects.Struct):
 
         # the offset is different on 32 and 64 bits
         symbol_table_name = self.vol.type_name.split(constants.BANG)[0]
-        if not symbols.utility.symbol_table_is_64bit(self.context, symbol_table_name):
+        if not symbols.utility.symbol_table_is_64bit(self._context, symbol_table_name):
             vad_address -= 4
         else:
             vad_address -= 12