diff --git a/test/cpp/microbenchmarks/BUILD b/test/cpp/microbenchmarks/BUILD
index 5ae9a9a7910..097e92f5836 100644
--- a/test/cpp/microbenchmarks/BUILD
+++ b/test/cpp/microbenchmarks/BUILD
@@ -29,6 +29,7 @@ grpc_cc_test(
 
 grpc_cc_library(
     name = "helpers",
+    testonly = 1,
     srcs = ["helpers.cc"],
     hdrs = [
         "fullstack_context_mutators.h",
@@ -55,6 +56,7 @@ grpc_cc_binary(
 
 grpc_cc_binary(
     name = "bm_arena",
+    testonly = 1,
     srcs = ["bm_arena.cc"],
     deps = [":helpers"],
 )
@@ -68,6 +70,7 @@ grpc_cc_binary(
 
 grpc_cc_binary(
     name = "bm_call_create",
+    testonly = 1,
     srcs = ["bm_call_create.cc"],
     deps = [":helpers"],
 )
@@ -95,6 +98,7 @@ grpc_cc_binary(
 
 grpc_cc_library(
     name = "fullstack_streaming_ping_pong_h",
+    testonly = 1,
     hdrs = [
         "fullstack_streaming_ping_pong.h",
     ],
@@ -112,6 +116,7 @@ grpc_cc_binary(
 
 grpc_cc_library(
     name = "fullstack_streaming_pump_h",
+    testonly = 1,
     hdrs = [
         "fullstack_streaming_pump.h",
     ],
@@ -129,12 +134,14 @@ grpc_cc_binary(
 
 grpc_cc_binary(
     name = "bm_fullstack_trickle",
+    testonly = 1,
     srcs = ["bm_fullstack_trickle.cc"],
     deps = [":helpers"],
 )
 
 grpc_cc_library(
     name = "fullstack_unary_ping_pong_h",
+    testonly = 1,
     hdrs = [
         "fullstack_unary_ping_pong.h",
     ],