diff --git a/test/erl/src/test_membuffer.erl b/test/erl/src/test_membuffer.erl
index 7bd23a0..e576ccd 100644
--- a/test/erl/src/test_membuffer.erl
+++ b/test/erl/src/test_membuffer.erl
@@ -30,12 +30,12 @@
 
 t1() ->
     {ok, Transport} = thrift_memory_buffer:new(),
-    {ok, Protocol} = thrift_binary_protocol:new(Transport),
+    {ok, Protocol0} = thrift_binary_protocol:new(Transport),
     TestData = test_data(),
-    ok = thrift_protocol:write(Protocol,
+		{Protocol1, ok} = thrift_protocol:write(Protocol0,
 			       {{struct, element(2, thriftTest_types:struct_info('xtruct'))},
 				TestData}),
-    {ok, Result} = thrift_protocol:read(Protocol,
+		{_Protocol2, {ok, Result}} = thrift_protocol:read(Protocol1,
 					{struct, element(2, thriftTest_types:struct_info('xtruct'))},
 					'xtruct'),
 
@@ -44,12 +44,12 @@
 
 t2() ->
     {ok, Transport} = thrift_memory_buffer:new(),
-    {ok, Protocol} = thrift_binary_protocol:new(Transport),
+    {ok, Protocol0} = thrift_binary_protocol:new(Transport),
     TestData = test_data(),
-    ok = thrift_protocol:write(Protocol,
+		{Protocol1, ok} = thrift_protocol:write(Protocol0,
 			       {{struct, element(2, thriftTest_types:struct_info('xtruct'))},
 				TestData}),
-    {ok, Result} = thrift_protocol:read(Protocol,
+		{_Protocol2, {ok, Result}} = thrift_protocol:read(Protocol1,
 					{struct, element(2, thriftTest_types:struct_info('xtruct3'))},
 					'xtruct3'),
 
@@ -61,12 +61,12 @@
 
 t3() ->
     {ok, Transport} = thrift_memory_buffer:new(),
-    {ok, Protocol} = thrift_binary_protocol:new(Transport),
+    {ok, Protocol0} = thrift_binary_protocol:new(Transport),
     TestData = #bools{im_true = true, im_false = false},
-    ok = thrift_protocol:write(Protocol,
+		{Protocol1, ok} = thrift_protocol:write(Protocol0,
 			       {{struct, element(2, thriftTest_types:struct_info('bools'))},
 				TestData}),
-    {ok, Result} = thrift_protocol:read(Protocol,
+		{_Protocol2, {ok, Result}} = thrift_protocol:read(Protocol1,
 					{struct, element(2, thriftTest_types:struct_info('bools'))},
 					'bools'),