diff --git a/glibc.spec b/glibc.spec
index f29d68e..798b2a3 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -87,7 +87,7 @@
 
 Name:          glibc
 Version:       2.40
-Release:       4mamba
+Release:       5mamba
 Summary:       The GNU libc libraries
 Group:         System/Libraries
 Vendor:        openmamba
@@ -540,8 +540,11 @@ ln -s ../lib/locale %{buildroot}/usr/lib32/locale
       done
    popd
    # Add SUPPORTED file to package
-   install -m0644 localedata/SUPPORTED %{buildroot}%{glibc_datadir}/i18n/
-   [-e %{buildroot}%{glibc_libdir}/libbsd-compat.a ] && ln -sf libbsd-compat.a %{buildroot}%{glibc_libdir}/libbsd.a
+   # Note: needs to be reformatted like /etc/locale.gen e.g. for Calamares
+   sed -e '1,3d' -e 's|/| |g' -e 's| \\||g' \
+      localedata/SUPPORTED > %{buildroot}%{glibc_datadir}/i18n/SUPPORTED
+
+[-e %{buildroot}%{glibc_libdir}/libbsd-compat.a ] && ln -sf libbsd-compat.a %{buildroot}%{glibc_libdir}/libbsd.a
 %else
   # stage 1
    make -C ../glibc-build-%{_target_platform} install-headers install_root=%{buildroot} cross-compiling=yes
@@ -863,6 +866,9 @@ fi
 %endif
 
 %changelog
+* Sun Oct 20 2024 Silvan Calarco <silvan.calarco@mambasoft.it> 2.40-5mamba
+- format /usr/share/i18n/SUPPORTED as expected to fix locale.conf and locale.gen configuration with Calamares
+
 * Sun Oct 13 2024 Silvan Calarco <silvan.calarco@mambasoft.it> 2.40-4mamba
 - move locale.gen configuration from glibc to glibc-utils to fix some  upgrade failures cases