diff --git a/src/gui/lua/lua_api_version.h b/src/gui/lua/lua_api_version.h
index 6f932f261..7d33c9c18 100644
--- a/src/gui/lua/lua_api_version.h
+++ b/src/gui/lua/lua_api_version.h
@@ -4,4 +4,4 @@
  * to luainstance.h changes
  */
 #define LUA_API_VERSION_MAJOR 1
-#define LUA_API_VERSION_MINOR 76
+#define LUA_API_VERSION_MINOR 77
diff --git a/src/gui/lua/lua_curl.cpp b/src/gui/lua/lua_curl.cpp
index b5163677e..1407d4eb2 100644
--- a/src/gui/lua/lua_curl.cpp
+++ b/src/gui/lua/lua_curl.cpp
@@ -271,8 +271,10 @@ Example:
 	if (!userAgent.empty())
 		curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, userAgent.c_str());
 
-	if (!postfields.empty())
+	if (!postfields.empty()) {
+		curl_easy_setopt(curl_handle, CURLOPT_POSTFIELDSIZE, static_cast<long>(postfields.length()));
 		curl_easy_setopt(curl_handle, CURLOPT_POSTFIELDS, postfields.c_str());
+	}
 
 	if (ipv4 && ipv6)
 		curl_easy_setopt(curl_handle, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_WHATEVER);