diff --git a/mariadb.spec b/mariadb.spec
index a3e6a1d..039108d 100644
--- a/mariadb.spec
+++ b/mariadb.spec
@@ -667,7 +667,7 @@ ln -sf %{_unitdir}/mariadb@.service %{buildroot}%{_unitdir}/mysql@.service
 
 # Replace the default socket for multi instance mariadb with the one used by
 # mysql-systemd-helper
-sed -e 's:mysql.sock-%I:mysql.%I.sock:' %{buildroot}%{_unitdir}/mariadb@.socket
+sed -e 's:mysql.sock-%I:mysql.%I.sock:' -i %{buildroot}%{_unitdir}/mariadb@.socket
 
 # Tmpfiles file to exclude mysql tempfiles that are auto-cleaned up
 # bnc#852451