diff --git a/src/libostree/ostree-repo-static-delta-core.c b/src/libostree/ostree-repo-static-delta-core.c
index c419df5629..7052ba72e5 100644
--- a/src/libostree/ostree-repo-static-delta-core.c
+++ b/src/libostree/ostree-repo-static-delta-core.c
@@ -409,6 +409,9 @@ ostree_repo_static_delta_execute_offline_with_signature (OstreeRepo *self, GFile
         return glnx_throw_errno_prefix (error, "openat(O_DIRECTORY)");
       else
         {
+          char ch = '.';
+          if (dir_or_file_path[strlen(dir_or_file_path) - 1] == G_DIR_SEPARATOR)
+            strncat(dir_or_file_path, &ch, 1);
           g_autofree char *dir = g_path_get_dirname (dir_or_file_path);
           basename = g_path_get_basename (dir_or_file_path);