diff --git a/R/azcopy.R b/R/azcopy.R
index 9be6bcf..95f7926 100644
--- a/R/azcopy.R
+++ b/R/azcopy.R
@@ -125,13 +125,13 @@ azcopy_download_opts.blob_container <- function(container, overwrite=FALSE, recu
       if(check_md5) c("--check-md5", "FailIfDifferent"))
 }
 
-azcopy_download_opts.file_share  <- function(container, overwrite=FALSE, recursive=FALSE, ...)
+azcopy_download_opts.file_share  <- function(container, overwrite=FALSE, recursive=FALSE, check_md5=FALSE, ...)
 {
     c(paste0("--overwrite=", tolower(as.character(overwrite))), if(recursive) "--recursive",
       if(check_md5) c("--check-md5", "FailIfDifferent"))
 }
 
-azcopy_download_opts.adls_filesystem <- function(container, overwrite=FALSE, recursive=FALSE, ...)
+azcopy_download_opts.adls_filesystem <- function(container, overwrite=FALSE, recursive=FALSE, check_md5=FALSE, ...)
 {
     c(paste0("--overwrite=", tolower(as.character(overwrite))), if(recursive) "--recursive",
       if(check_md5) c("--check-md5", "FailIfDifferent"))