--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -64,6 +64,7 @@
   # Download selected source archive
   ExternalProject_add(download_ninja_source
     SOURCE_DIR ${Ninja_SOURCE_DIR}
+    DOWNLOAD_COMMAND ""
     URL ${${src_archive}_url}
     URL_HASH SHA256=${${src_archive}_sha256}
     DOWNLOAD_DIR ${ARCHIVE_DOWNLOAD_DIR}