diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7557743..c22e703 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,7 +11,7 @@ option(COUNTLY_USE_CUSTOM_HTTP "Use a custom HTTP library" OFF)
 option(COUNTLY_USE_SQLITE "Use SQLite" OFF)
 option(COUNTLY_BUILD_TESTS "Build test programs" OFF)
 
-if (NOT BUILD_SHARED_LIBS AND NOT COUNTLY_CUSTOM_HTTP)
+if (NOT WIN32 AND NOT BUILD_SHARED_LIBS AND NOT COUNTLY_CUSTOM_HTTP)
   message(FATAL_ERROR "You must provide a custom HTTP function when compiling statically.")
 endif()
 
@@ -33,6 +33,13 @@ target_link_libraries(countly Threads::Threads)
 
 target_include_directories(countly PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/vendor/json/include)
 
+if (APPLE)
+  set(OPENSSL_ROOT_DIR "/usr/local/opt/openssl")
+endif()
+find_package(OpenSSL REQUIRED)
+target_include_directories(countly PRIVATE ${OPENSSL_INCLUDE_DIR})
+target_link_libraries(countly ${OPENSSL_LIBRARIES})
+
 if(COUNTLY_USE_CUSTOM_HTTP)
   target_compile_definitions(countly PRIVATE COUNTLY_USE_CUSTOM_HTTP)
 elseif(NOT WIN32)
@@ -47,12 +54,6 @@ if(COUNTLY_USE_SQLITE)
   find_package(Sqlite3)
   target_include_directories(countly PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/vendor/sqlite)
   target_link_libraries(countly sqlite3)
-  if (APPLE)
-    set(OPENSSL_ROOT_DIR "/usr/local/opt/openssl")
-  endif()
-  find_package(OpenSSL REQUIRED)
-  target_include_directories(countly PRIVATE ${OPENSSL_INCLUDE_DIRS})
-  target_link_libraries(countly ${OPENSSL_LIBRARIES})
 endif()
 
 if(COUNTLY_BUILD_TESTS)
diff --git a/include/countly.hpp b/include/countly.hpp
index cbd555f..ccf1317 100644
--- a/include/countly.hpp
+++ b/include/countly.hpp
@@ -15,6 +15,10 @@
 #include "nlohmann/json.hpp"
 using json = nlohmann::json;
 
+#ifdef _WIN32
+#undef ERROR
+#endif
+
 #define COUNTLY_SDK_NAME "cpp-native-unknown"
 #define COUNTLY_SDK_VERSION "0.1.0"
 #define COUNTLY_API_VERSION "19.8.0"
@@ -136,6 +140,8 @@ class Countly {
 	void SetPath(const std::string& path) {
 #ifdef COUNTLY_USE_SQLITE
 		setDatabasePath(path);
+#elif defined _WIN32
+		UNREFERENCED_PARAMETER(path);
 #endif
 	}
 
diff --git a/src/countly.cpp b/src/countly.cpp
index 18df26f..aa0cf2e 100644
--- a/src/countly.cpp
+++ b/src/countly.cpp
@@ -17,6 +17,7 @@ using json = nlohmann::json;
 #ifdef _WIN32
 #include "Windows.h"
 #include "WinHTTP.h"
+#undef ERROR
 #pragma comment(lib, "winhttp.lib")
 #else
 #include "curl/curl.h"
@@ -694,7 +695,7 @@ Countly::HTTPResponse Countly::sendHTTP(std::string path, std::string data) {
 	}
 
 	if (hRequest) {
-		bool ok = WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, use_post ? data.c_str() : WINHTTP_NO_REQUEST_DATA, use_post ? data.size() : 0, 0, nullptr) != 0;
+		bool ok = WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, use_post ? (LPVOID)data.data() : WINHTTP_NO_REQUEST_DATA, use_post ? data.size() : 0, 0, 0) != 0;
 		if (ok) {
 			ok = WinHttpReceiveResponse(hRequest, NULL);
 			if (ok) {