3 files changed, 6 insertions, 6 deletions
diff --git a/test/core/nanopb/BUILD b/test/core/nanopb/BUILD
index f332207e2d..1497f829ab 100644
--- a/test/core/nanopb/BUILD
+++ b/test/core/nanopb/BUILD
@@ -22,8 +22,8 @@ load("//test/core/util:grpc_fuzzer.bzl", "grpc_fuzzer")
 
 grpc_fuzzer(
     name = "fuzzer_response",
-    srcs = ["fuzzer_response.c"],
-    language = "C",
+    srcs = ["fuzzer_response.cc"],
+    language = "C++",
     corpus = "corpus_response",
     deps = [
         "//:gpr",
@@ -34,8 +34,8 @@ grpc_fuzzer(
 
 grpc_fuzzer(
     name = "fuzzer_serverlist",
-    srcs = ["fuzzer_serverlist.c"],
-    language = "C",
+    srcs = ["fuzzer_serverlist.cc"],
+    language = "C++",
     corpus = "corpus_serverlist",
     deps = [
         "//:gpr",
diff --git a/test/core/nanopb/fuzzer_response.c b/test/core/nanopb/fuzzer_response.cc
index 42826c18f3..7039c801cb 100644
--- a/test/core/nanopb/fuzzer_response.c
+++ b/test/core/nanopb/fuzzer_response.cc
@@ -28,7 +28,7 @@ bool leak_check = true;
 
 static void dont_log(gpr_log_func_args* args) {}
 
-int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   if (squelch) gpr_set_log_function(dont_log);
   grpc_slice slice = grpc_slice_from_copied_buffer((const char*)data, size);
   grpc_grpclb_initial_response* response;
diff --git a/test/core/nanopb/fuzzer_serverlist.c b/test/core/nanopb/fuzzer_serverlist.cc
index 059e33d584..0a6b1767a1 100644
--- a/test/core/nanopb/fuzzer_serverlist.c
+++ b/test/core/nanopb/fuzzer_serverlist.cc
@@ -28,7 +28,7 @@ bool leak_check = true;
 
 static void dont_log(gpr_log_func_args* args) {}
 
-int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   if (squelch) gpr_set_log_function(dont_log);
   grpc_slice slice = grpc_slice_from_copied_buffer((const char*)data, size);
   grpc_grpclb_serverlist* serverlist;