diff --git a/test/py/SerializationTest.py b/test/py/SerializationTest.py
index d6308f0..f4f3a4f 100755
--- a/test/py/SerializationTest.py
+++ b/test/py/SerializationTest.py
@@ -292,7 +292,7 @@
 
 
 class AcceleratedBinaryTest(AbstractTest):
-    protocol_factory = TBinaryProtocol.TBinaryProtocolAcceleratedFactory()
+    protocol_factory = TBinaryProtocol.TBinaryProtocolAcceleratedFactory(fallback=False)
 
 
 class CompactProtocolTest(AbstractTest):
@@ -300,7 +300,7 @@
 
 
 class AcceleratedCompactTest(AbstractTest):
-    protocol_factory = TCompactProtocol.TCompactProtocolAcceleratedFactory()
+    protocol_factory = TCompactProtocol.TCompactProtocolAcceleratedFactory(fallback=False)
 
 
 class JSONProtocolTest(AbstractTest):