diff --git a/contrib/macdeploy/README.md b/contrib/macdeploy/README.md
index fd7d4dea988..dbb00f78a2d 100644
--- a/contrib/macdeploy/README.md
+++ b/contrib/macdeploy/README.md
@@ -52,7 +52,7 @@ path to `Xcode.app` (extracted in the previous stage) as the first argument.
 ```
 
 The generated archive should be: `Xcode-15.0-15A240d-extracted-SDK-with-libcxx-headers.tar.gz`.
-The `sha256sum` should be `250cc83511f8548c8a91012f143a17ad38910fc8f14b45f28240ec46df612697`.
+The `sha256sum` should be `2184c9699203ca32521899ca0deec831f2b6af214549c85bfad6ef8554d7778e`.
 
 ## Deterministic macOS App Notes
 
diff --git a/contrib/macdeploy/gen-sdk b/contrib/macdeploy/gen-sdk
index 3e64189062b..7e3c8bc7c9b 100755
--- a/contrib/macdeploy/gen-sdk
+++ b/contrib/macdeploy/gen-sdk
@@ -54,7 +54,7 @@ def run():
         out_sdktgz_path = pathlib.Path("./{}.tar.gz".format(out_name))
 
     def tarfp_add_with_base_change(tarfp, dir_to_add, alt_base_dir):
-        """Add all files in dir_to_add to tarfp, but prepent alt_base_dir to the files'
+        """Add all files in dir_to_add to tarfp, but prepend alt_base_dir to the files'
         names
 
         e.g. if the only file under /root/bazdir is /root/bazdir/qux, invoking:
@@ -87,7 +87,7 @@ def run():
 
     print("Creating output .tar.gz file...")
     with out_sdktgz_path.open("wb") as fp:
-        with gzip.GzipFile(fileobj=fp, mode='wb', compresslevel=9, mtime=0) as gzf:
+        with gzip.GzipFile(fileobj=fp, mode='wb', compresslevel=0, mtime=0) as gzf:
             with tarfile.open(mode="w", fileobj=gzf, format=tarfile.GNU_FORMAT) as tarfp:
                 print("Adding MacOSX SDK {} files...".format(sdk_version))
                 tarfp_add_with_base_change(tarfp, sdk_dir, out_name)