diff --git a/dlls/wininet/internet.h b/dlls/wininet/internet.h
index 4044bbf907b..8c3a1f1f3c2 100644
--- a/dlls/wininet/internet.h
+++ b/dlls/wininet/internet.h
@@ -68,6 +68,7 @@ typedef struct
 {
     int socket;
     BOOL secure;
+    BOOL is_blocking;
     CtxtHandle ssl_ctx;
     SecPkgContext_StreamSizes ssl_sizes;
     server_t *server;
diff --git a/dlls/wininet/netconnection.c b/dlls/wininet/netconnection.c
index 983782ddd65..73058602f6a 100644
--- a/dlls/wininet/netconnection.c
+++ b/dlls/wininet/netconnection.c
@@ -282,8 +282,11 @@ void init_winsock(void)
 
 static void set_socket_blocking(netconn_t *conn, BOOL is_blocking)
 {
-    ULONG arg = !is_blocking;
-    ioctlsocket(conn->socket, FIONBIO, &arg);
+    if(conn->is_blocking != is_blocking) {
+        ULONG arg = !is_blocking;
+        ioctlsocket(conn->socket, FIONBIO, &arg);
+    }
+    conn->is_blocking = is_blocking;
 }
 
 static DWORD create_netconn_socket(server_t *server, netconn_t *netconn, DWORD timeout)