diff --git a/contrib/gitian-descriptors/gitian-osx-signer.yml b/contrib/gitian-descriptors/gitian-osx-signer.yml
index 4c4e3ff82..cfd9b2615 100644
--- a/contrib/gitian-descriptors/gitian-osx-signer.yml
+++ b/contrib/gitian-descriptors/gitian-osx-signer.yml
@@ -33,5 +33,5 @@ script: |
 
   tar -xf ${UNSIGNED}
   ./detached-sig-apply.sh ${UNSIGNED} signature/osx
-  ${WRAP_DIR}/genisoimage -no-cache-inodes -D -l -probe -V "Bitcoin-Core" -no-pad -r -apple -o uncompressed.dmg signed-app
+  ${WRAP_DIR}/genisoimage -no-cache-inodes -D -l -probe -V "Bitcoin-Core" -no-pad -r -dir-mode 0755 -apple -o uncompressed.dmg signed-app
   ${WRAP_DIR}/dmg dmg uncompressed.dmg ${OUTDIR}/${SIGNED}