diff --git a/helpers/helpers.v1.d/apt b/helpers/helpers.v1.d/apt
index c3fd9aa07..26d37b2b5 100644
--- a/helpers/helpers.v1.d/apt
+++ b/helpers/helpers.v1.d/apt
@@ -187,6 +187,8 @@ ynh_package_install_from_equivs() {
     # Build and install the package
     local TMPDIR=$(mktemp --directory)
     mkdir -p ${TMPDIR}/${pkgname}/DEBIAN/
+    # For some reason, dpkg-deb insists for folder perm to be 755 and sometimes it's 777 o_O?
+    chmod -R 755 ${TMPDIR}/${pkgname}
 
     # Note that the cd executes into a sub shell
     # Create a fake deb package with equivs-build and the given control file
diff --git a/helpers/helpers.v2.1.d/apt b/helpers/helpers.v2.1.d/apt
index 3930f5e9c..3d58f2305 100644
--- a/helpers/helpers.v2.1.d/apt
+++ b/helpers/helpers.v2.1.d/apt
@@ -97,6 +97,9 @@ ynh_apt_install_dependencies() {
     # Prepare the virtual-dependency control file for dpkg-deb --build
     local TMPDIR=$(mktemp --directory)
     mkdir -p ${TMPDIR}/${app_ynh_deps}/DEBIAN
+    # For some reason, dpkg-deb insists for folder perm to be 755 and sometimes it's 777 o_O?
+    chmod -R 755 ${TMPDIR}/${pkgname}
+
     cat >${TMPDIR}/${app_ynh_deps}/DEBIAN/control <<EOF
 Section: misc
 Priority: optional