diff --git a/wolfcrypt/benchmark/benchmark.c b/wolfcrypt/benchmark/benchmark.c
index 2700772a8..c81d38058 100644
--- a/wolfcrypt/benchmark/benchmark.c
+++ b/wolfcrypt/benchmark/benchmark.c
@@ -253,7 +253,7 @@ void bench_rng(void);
 
 #if defined(DEBUG_WOLFSSL) && !defined(HAVE_VALGRIND) && \
         !defined(HAVE_STACK_SIZE)
-    WOLFSSL_API int wolfSSL_Debugging_ON();
+    WOLFSSL_API int wolfSSL_Debugging_ON(void);
     WOLFSSL_API void wolfSSL_Debugging_OFF(void);
 #endif