diff --git a/test/core/util/BUILD b/test/core/util/BUILD
index bc6fe9dd64b..24379234351 100644
--- a/test/core/util/BUILD
+++ b/test/core/util/BUILD
@@ -103,6 +103,7 @@ grpc_cc_library(
 
 grpc_cc_library(
     name = "fuzzer_corpus_test",
+    testonly = 1,
     srcs = ["fuzzer_corpus_test.cc"],
     deps = [
         ":gpr_test_util",