diff --git a/lib/libwebsockets.h b/lib/libwebsockets.h
index 834f3952..db7792eb 100644
--- a/lib/libwebsockets.h
+++ b/lib/libwebsockets.h
@@ -297,13 +297,6 @@ lwsl_timestamp(int level, char *p, int len);
 #define lwsl_ext(...)  _lws_log(LLL_EXT, __VA_ARGS__)
 #define lwsl_client(...) _lws_log(LLL_CLIENT, __VA_ARGS__)
 #define lwsl_latency(...) _lws_log(LLL_LATENCY, __VA_ARGS__)
-/**
- * lwsl_hexdump() - helper to hexdump a buffer (DEBUG builds only)
- *
- * \param buf: buffer start to dump
- * \param len: length of buffer to dump
- */
-LWS_VISIBLE LWS_EXTERN void lwsl_hexdump(void *buf, size_t len);
 
 #else /* no debug */
 #if defined(LWS_WITH_NO_LOGS)
@@ -317,10 +310,17 @@ LWS_VISIBLE LWS_EXTERN void lwsl_hexdump(void *buf, size_t len);
 #define lwsl_ext(...) do {} while(0)
 #define lwsl_client(...) do {} while(0)
 #define lwsl_latency(...) do {} while(0)
-#define lwsl_hexdump(a, b)
 
 #endif
 
+/**
+ * lwsl_hexdump() - helper to hexdump a buffer (DEBUG builds only)
+ *
+ * \param buf: buffer start to dump
+ * \param len: length of buffer to dump
+ */
+LWS_VISIBLE LWS_EXTERN void lwsl_hexdump(const void *buf, size_t len);
+
 static LWS_INLINE int lws_is_be(void) {
 	const int probe = ~0xff;
 
diff --git a/lib/output.c b/lib/output.c
index 465cb5f7..d67e06fe 100644
--- a/lib/output.c
+++ b/lib/output.c
@@ -46,9 +46,7 @@ lws_0405_frame_mask_generate(struct lws *wsi)
 	return 0;
 }
 
-#ifdef _DEBUG
-
-LWS_VISIBLE void lwsl_hexdump(void *vbuf, size_t len)
+LWS_VISIBLE void lwsl_hexdump(const void *vbuf, size_t len)
 {
 	unsigned char *buf = (unsigned char *)vbuf;
 	unsigned int n, m, start;
@@ -82,12 +80,11 @@ LWS_VISIBLE void lwsl_hexdump(void *vbuf, size_t len)
 		*p++ = '\n';
 		*p = '\0';
 		lwsl_debug("%s", line);
+		(void)line;
 	}
 	lwsl_debug("\n");
 }
 
-#endif
-
 /*
  * notice this returns number of bytes consumed, or -1
  */