diff --git a/ports/rxcpp/portfile.cmake b/ports/rxcpp/portfile.cmake
index 440c7ccf3..4a321222d 100644
--- a/ports/rxcpp/portfile.cmake
+++ b/ports/rxcpp/portfile.cmake
@@ -3,7 +3,7 @@ include(vcpkg_common_functions)
 set(SOURCE_PATH ${CURRENT_BUILDTREES_DIR}/src/RxCpp-3.0.0)
 vcpkg_download_distfile(ARCHIVE
     URLS "https://github.com/Reactive-Extensions/RxCpp/archive/v3.0.0.tar.gz"
-    FILENAME "v3.0.0.tar.gz"
+    FILENAME "RxCpp-v3.0.0.tar.gz"
     SHA512 6d810b6163d0920d531f32a13729e290c81b47d5fc9c3e3d3d8a25d27a6f0671fec097d091bef7383b7e556e9e5471db087bb955e7f4fd9a5fdc9e7b06050844
 )
 vcpkg_extract_source_archive(${ARCHIVE})