diff --git a/tests/tests_libcrun_fuzzer.c b/tests/tests_libcrun_fuzzer.c
index 313c25c7a8..ef4a2c6651 100644
--- a/tests/tests_libcrun_fuzzer.c
+++ b/tests/tests_libcrun_fuzzer.c
@@ -463,7 +463,7 @@ LLVMFuzzerTestOneInput (uint8_t *buf, size_t len)
 }
 
 static void
-sig_chld (int)
+sig_chld (int sig arg_unused)
 {
   int status;
   pid_t p;