diff --git a/gdb-port/parser.py b/gdb-port/parser.py
index ff10bceb79fe8bbc320ea409907dac2acedc8f9c..7de55d2bd4fb930c76b6907b21056dc32dbe4ee4 100644
--- a/gdb-port/parser.py
+++ b/gdb-port/parser.py
@@ -133,7 +133,6 @@ class ParserStack:
 		self.partial_alloc_counts.append(None)
 		if self.top_level_parse.memory_stat_method == HammerMemoryStatisticsMethod.DETAILED_ARENA_STATS:
 			#TODO: check that self.arena is same as gdb.selected_frame()'s arena
-			self.cumulative_byte_differences = []
 			self.stack_events.append((StackEvent.PUSH, int(self.arena_gdbval['arena_malloc_bytes']), parser))
 			prev = 0
 			#print("Bytes allocated since last h_do_parse:", thusfar, ", parser:", str(parser)) # DEBUG