diff --git a/sdk/core/azure-core/src/http/winhttp/win_http_transport.cpp b/sdk/core/azure-core/src/http/winhttp/win_http_transport.cpp
index 6aea60d17..f2f5ea1cd 100644
--- a/sdk/core/azure-core/src/http/winhttp/win_http_transport.cpp
+++ b/sdk/core/azure-core/src/http/winhttp/win_http_transport.cpp
@@ -1419,6 +1419,10 @@ int64_t _detail::WinHttpRequest::GetContentLength(
 std::unique_ptr<RawResponse> _detail::WinHttpRequest::SendRequestAndGetResponse(
     HttpMethod requestMethod)
 {
+  // Suppress unused parameter warning (C4100).
+  // Keeping 'requestMethod' in the signature preserves API compatibility.
+  (void)requestMethod;
+
   // First, use WinHttpQueryHeaders to obtain the size of the buffer.
   // The call is expected to fail since no destination buffer is provided.
   DWORD sizeOfHeaders = 0;