diff --git a/server/proxy/pf_config.c b/server/proxy/pf_config.c
index 1416ed9de..1a5bc14d9 100644
--- a/server/proxy/pf_config.c
+++ b/server/proxy/pf_config.c
@@ -378,7 +378,8 @@ static char* pf_config_decode_base64(const char* data, const char* name, size_t*
 	char* decoded = NULL;
 	if (!data)
 	{
-		WLog_ERR(TAG, "Invalid base64 data [%p] for %s", data, name);
+		WLog_ERR(TAG, "Invalid base64 data [%p] for %s", WINPR_CXX_COMPAT_CAST(const void*, data),
+		         name);
 		return NULL;
 	}