diff --git a/doc/interop-test-descriptions.md b/doc/interop-test-descriptions.md
index 7fd21c7022e..6a76acd3a89 100644
--- a/doc/interop-test-descriptions.md
+++ b/doc/interop-test-descriptions.md
@@ -224,7 +224,7 @@ Procedure:
         size: 31415
       }
       response_parameters:{
-        size: 59
+        size: 9
       }
       response_parameters:{
         size: 2653
@@ -261,20 +261,19 @@ Procedure:
       request_compressed_response: bool
       response_type:COMPRESSABLE
       response_parameters:{
-        size: 31415
-      }
-      response_parameters:{
-        size: 59
-      }
-      response_parameters:{
-        size: 2653
+        size: 31424
       }
       response_parameters:{
-        size: 58979
+        size: 61632
       }
     }
     ```
 
+    Note that the `response_parameters` sizes are the sum of the usual streaming
+    response sizes (31415, 9, 2653, 58979) taken in successive pairs. This way,
+    we only keep a single list of sizes while making sure the individual message
+    sizes are large enough to trigger compression in all implementations.
+
     Client asserts:
     * call was successful
     * exactly four responses
@@ -283,7 +282,7 @@ Procedure:
       NOT have the compressed message flag set.
     * if `request_compressed_response` is true, the response's messages MUST
       have the compressed message flag set.
-    * response payload bodies are sized (in order): 31415, 59, 2653, 58979
+    * response payload bodies are sized (in order): 31424, 61632
     * clients are free to assert that the response payload body contents are
       zero and comparing the entire response messages against golden responses
 
@@ -295,16 +294,10 @@ Procedure:
       request_compressed_response: bool
       response_type:UNCOMPRESSABLE
       response_parameters:{
-        size: 31415
-      }
-      response_parameters:{
-        size: 59
-      }
-      response_parameters:{
-        size: 2653
+        size: 31424
       }
       response_parameters:{
-        size: 58979
+        size: 61632
       }
     }
     ```
@@ -316,10 +309,7 @@ Procedure:
     * the response MAY have the compressed message flag set. Some
       implementations will choose to compress the payload even when the output
       size if larger than the input.
-    * response payload bodies are sized (in order): 31415, 59, 2653, 58979
-    * clients are free to assert that the body of the responses are identical to
-      the golden uncompressable data at `test/cpp/interop/rnd.dat`.
-
+    * response payload bodies are sized (in order): 31424, 61632
 
 ### ping_pong
 
@@ -350,7 +340,7 @@ Procedure:
     {
       response_type: COMPRESSABLE
       response_parameters:{
-        size: 59
+        size: 9
       }
       payload:{
         body: 8 bytes of zeros
diff --git a/test/cpp/interop/interop_client.cc b/test/cpp/interop/interop_client.cc
index a0479e8f689..7705bb15922 100644
--- a/test/cpp/interop/interop_client.cc
+++ b/test/cpp/interop/interop_client.cc
@@ -58,7 +58,7 @@ namespace testing {
 namespace {
 // The same value is defined by the Java client.
 const std::vector<int> request_stream_sizes = {27182, 8, 1828, 45904};
-const std::vector<int> response_stream_sizes = {31415, 59, 2653, 58979};
+const std::vector<int> response_stream_sizes = {31415, 9, 2653, 58979};
 const int kNumResponseMessages = 2000;
 const int kResponseMessageSize = 1030;
 const int kReceiveDelayMilliSeconds = 20;
@@ -466,10 +466,11 @@ bool InteropClient::DoResponseCompressedStreaming() {
       request.set_response_type(payload_types[i]);
       request.set_request_compressed_response(request_compression[j]);
 
-      for (size_t k = 0; k < response_stream_sizes.size(); ++k) {
+      for (size_t k = 0; k < response_stream_sizes.size() / 2; ++k) {
         ResponseParameters* response_parameter =
             request.add_response_parameters();
-        response_parameter->set_size(response_stream_sizes[k]);
+        response_parameter->set_size(response_stream_sizes[k] +
+                                     response_stream_sizes[k + 1]);
       }
       StreamingOutputCallResponse response;
 
@@ -483,7 +484,9 @@ bool InteropClient::DoResponseCompressedStreaming() {
         switch (response.payload().type()) {
           case PayloadType::COMPRESSABLE:
             GPR_ASSERT(response.payload().body() ==
-                       grpc::string(response_stream_sizes[k], '\0'));
+                       grpc::string(response_stream_sizes[k] +
+                                        response_stream_sizes[k + 1],
+                                    '\0'));
             break;
           case PayloadType::UNCOMPRESSABLE:
             break;
@@ -513,14 +516,14 @@ bool InteropClient::DoResponseCompressedStreaming() {
       gpr_log(GPR_DEBUG, "Response streaming done %s.", log_suffix);
       gpr_free(log_suffix);
 
-      if (k < response_stream_sizes.size()) {
+      if (k < response_stream_sizes.size() / 2) {
         // stream->Read() failed before reading all the expected messages. This
         // is most likely due to a connection failure.
         gpr_log(GPR_ERROR,
                 "DoResponseCompressedStreaming(): Responses read (k=%d) is "
                 "less than the expected messages (i.e "
-                "response_stream_sizes.size() (%d)). (i=%d, j=%d)",
-                k, response_stream_sizes.size(), i, j);
+                "response_stream_sizes.size()/2 (%d)). (i=%d, j=%d)",
+                k, response_stream_sizes.size() / 2, i, j);
         return TransientFailureOrAbort();
       }