diff --git a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
index c5ad39bbe9af..fe847ebfb731 100644
--- a/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
+++ b/tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c
@@ -28,6 +28,10 @@ struct bpf_testmod_struct_arg_2 {
 	long b;
 };
 
+__diag_push();
+__diag_ignore_all("-Wmissing-prototypes",
+		  "Global functions as their definitions will be in bpf_testmod.ko BTF");
+
 noinline int
 bpf_testmod_test_struct_arg_1(struct bpf_testmod_struct_arg_2 a, int b, int c) {
 	bpf_testmod_test_struct_arg_result = a.a + a.b  + b + c;
@@ -175,6 +179,8 @@ noinline int bpf_testmod_fentry_test3(char a, int b, u64 c)
 	return a + b + c;
 }
 
+__diag_pop();
+
 int bpf_testmod_fentry_ok;
 
 noinline ssize_t