diff --git a/src/lib/platform/reset_util.h b/src/lib/platform/reset_util.h
index 52f568133..56e75da93 100644
--- a/src/lib/platform/reset_util.h
+++ b/src/lib/platform/reset_util.h
@@ -32,8 +32,8 @@
 #if defined(OPENTHREAD_ENABLE_COVERAGE) && OPENTHREAD_ENABLE_COVERAGE && defined(__GNUC__)
 #if __GNUC__ >= 11 || (defined(__clang__) && (defined(__APPLE__) && (__clang_major__ >= 13)) || \
                        (!defined(__APPLE__) && (__clang_major__ >= 12)))
-void __gcov_dump();
-void __gcov_reset();
+void __gcov_dump(void);
+void __gcov_reset(void);
 
 static void flush_gcov(void)
 {