diff --git a/README.md b/README.md
index 4c3859a..3f5cb02 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ Wire                | ❗              | ❌
 **OTHER LIBRARIES** |                |
 Wi-Fi STA/AP/Mixed  | ✔️             | ✔️/❌/❌
 Wi-Fi Events        | ✔️             | ❌
-TCP Client (SSL)    | ✔️ (✔️)        | ❗ (❓)
+TCP Client (SSL)    | ✔️ (✔️)        | ✔️ (❓)
 TCP Server          | ✔️             | ❓
 IPv6                | ❌              | ❌
 HTTP Client (SSL)   | ✔️ (✔️)        | ❓
diff --git a/arduino/libretuya/libraries/NetUtils/lwip/LwIPRxBuffer.cpp b/arduino/libretuya/libraries/NetUtils/lwip/LwIPRxBuffer.cpp
index fecf26f..8d60aed 100644
--- a/arduino/libretuya/libraries/NetUtils/lwip/LwIPRxBuffer.cpp
+++ b/arduino/libretuya/libraries/NetUtils/lwip/LwIPRxBuffer.cpp
@@ -17,8 +17,8 @@ size_t LwIPRxBuffer::r_available() {
 		LT_D_WC("_sock < 0");
 		return 0;
 	}
-	uint16_t count = 0;
-	int res		   = lwip_ioctl(_sock, FIONREAD, &count);
+	int count = 0; // must be of same size as in lwip_ioctl()
+	int res	  = lwip_ioctl(_sock, FIONREAD, &count);
 	if (res < 0) {
 		LT_D_WC("lwip_ioctl()=%d, errno=%d", res, errno);
 		_failed = true;