diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5f22ec77..f495087b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,7 +1,7 @@
 if (CMAKE_VERSION VERSION_LESS "3.0")
 	cmake_minimum_required(VERSION 2.8)
 else()
-	cmake_minimum_required(VERSION 3.6)
+	cmake_minimum_required(VERSION 3.10)
 endif()
 project(GmSSL C)
 
diff --git a/include/gmssl/error.h b/include/gmssl/error.h
index 497501e6..3185a688 100644
--- a/include/gmssl/error.h
+++ b/include/gmssl/error.h
@@ -30,7 +30,9 @@ extern "C" {
 
 
 
+#ifndef DEBUG
 #define DEBUG 1
+#endif
 
 #define warning_print() \
 	do { if (DEBUG) fprintf(stderr, "%s:%d:%s():\n",__FILE__, __LINE__, __FUNCTION__); } while (0)
diff --git a/src/tls.c b/src/tls.c
index d89dc1ee..31f3ba28 100644
--- a/src/tls.c
+++ b/src/tls.c
@@ -2321,7 +2321,7 @@ int tls_set_socket(TLS_CONNECT *conn, tls_socket_t sock)
 {
 	int flags = 0;
 #ifdef WIN32
-    	if( ioctlsocket(sock, FIONBIO, &flags) != 0)   {
+    	if( ioctlsocket(sock, FIONBIO, (u_long*)&flags) != 0)   {
 		error_puts("socket in non-blocking mode");
 		//nginx will pass a socket in non-blocking mode
 		//return -1;