diff -Naru flatpak-builder-1.0.14/src/builder-flatpak-utils.c flatpak-builder-1.0.14-new/src/builder-flatpak-utils.c
--- flatpak-builder-1.0.14/src/builder-flatpak-utils.c	2021-06-08 19:49:23.000000000 +0800
+++ flatpak-builder-1.0.14-new/src/builder-flatpak-utils.c	2022-07-05 14:04:40.697530000 +0800
@@ -1196,6 +1196,7 @@
 
 /* In numerical order of more privs */
 typedef enum {
+  FLATPAK_FILESYSTEM_MODE_NONE         = 0,
   FLATPAK_FILESYSTEM_MODE_READ_ONLY    = 1,
   FLATPAK_FILESYSTEM_MODE_READ_WRITE   = 2,
   FLATPAK_FILESYSTEM_MODE_CREATE       = 3,
@@ -1770,6 +1771,13 @@
       if (mode)
         *mode = FLATPAK_FILESYSTEM_MODE_CREATE;
     }
+  else if (g_str_equal (filesystem, "host:reset"))
+    {
+      filesystem = "host-reset";
+
+      if (mode)
+        *mode = FLATPAK_FILESYSTEM_MODE_NONE;
+    }
 
   return g_strndup (filesystem, len);
 }
@@ -1810,9 +1818,12 @@
 flatpak_context_remove_filesystem (FlatpakContext *context,
                                    const char     *what)
 {
+  FlatpakFilesystemMode mode;
+  g_autofree char *fs = parse_filesystem_flags (what, &mode);
+
   g_hash_table_insert (context->filesystems,
-                       parse_filesystem_flags (what, NULL),
-                       NULL);
+                        g_steal_pointer (&fs),
+                       GINT_TO_POINTER (mode));
 }
 
 static gboolean
@@ -2222,11 +2233,19 @@
       g_ptr_array_add (args, g_strdup_printf ("--system-%s-name=%s", flatpak_policy_to_string (policy), name));
     }
 
+  if (g_hash_table_lookup_extended (context->filesystems, "host-reset", NULL, NULL))
+    {
+      g_ptr_array_add (args, g_strdup ("--nofilesystem=host:reset"));
+    }
+
   g_hash_table_iter_init (&iter, context->filesystems);
   while (g_hash_table_iter_next (&iter, &key, &value))
     {
       FlatpakFilesystemMode mode = GPOINTER_TO_INT (value);
 
+      if (g_str_equal (key, "host-reset"))
+        continue;
+
       if (mode == FLATPAK_FILESYSTEM_MODE_READ_ONLY)
         g_ptr_array_add (args, g_strdup_printf ("--filesystem=%s:ro", (char *)key));
       else if (mode == FLATPAK_FILESYSTEM_MODE_READ_WRITE)
diff -Naru flatpak-builder-1.0.14/src/builder-main.c flatpak-builder-1.0.14-new/src/builder-main.c
--- flatpak-builder-1.0.14/src/builder-main.c	2021-06-08 16:18:15.000000000 +0800
+++ flatpak-builder-1.0.14-new/src/builder-main.c	2022-07-05 11:31:57.369694000 +0800
@@ -942,7 +942,7 @@
         "flatpak",
         "build",
         "--die-with-parent",
-        "--nofilesystem=host",
+        "--nofilesystem=host:reset",
         fs_app_dir,
         fs_cache,
         "--share=network",
diff -Naru flatpak-builder-1.0.14/src/builder-manifest.c flatpak-builder-1.0.14-new/src/builder-manifest.c
--- flatpak-builder-1.0.14/src/builder-manifest.c	2021-02-17 18:00:31.000000000 +0800
+++ flatpak-builder-1.0.14-new/src/builder-manifest.c	2022-07-05 11:31:56.359694000 +0800
@@ -2124,7 +2124,7 @@
   g_ptr_array_add (args, g_strdup ("build"));
 
   g_ptr_array_add (args, g_strdup ("--die-with-parent"));
-  g_ptr_array_add (args, g_strdup ("--nofilesystem=host"));
+  g_ptr_array_add (args, g_strdup ("--nofilesystem=host:reset"));
   if (extra_args)
     {
       for (i = 0; extra_args[i] != NULL; i++)
@@ -2304,7 +2304,7 @@
   g_ptr_array_add (args, g_strdup ("flatpak"));
   g_ptr_array_add (args, g_strdup ("build"));
   g_ptr_array_add (args, g_strdup ("--die-with-parent"));
-  g_ptr_array_add (args, g_strdup ("--nofilesystem=host"));
+  g_ptr_array_add (args, g_strdup ("--nofilesystem=host:reset"));
   g_ptr_array_add (args, g_file_get_path (app_dir));
   g_ptr_array_add (args, g_strdup ("appstream-compose"));
 
diff -Naru flatpak-builder-1.0.14/src/builder-module.c flatpak-builder-1.0.14-new/src/builder-module.c
--- flatpak-builder-1.0.14/src/builder-module.c	2019-09-13 21:46:32.000000000 +0800
+++ flatpak-builder-1.0.14-new/src/builder-module.c	2022-07-05 11:31:55.139694000 +0800
@@ -1176,7 +1176,7 @@
     builddir = "/run/build/";
 
   g_ptr_array_add (args, g_strdup_printf ("--env=FLATPAK_BUILDER_BUILDDIR=%s%s", builddir, module_name));
-  g_ptr_array_add (args, g_strdup ("--nofilesystem=host"));
+  g_ptr_array_add (args, g_strdup ("--nofilesystem=host:reset"));
 
   /* We mount the canonical location, because bind-mounts of symlinks don't really work */
   g_ptr_array_add (args, g_strdup_printf ("--filesystem=%s", source_dir_path_canonical));
diff -Naru flatpak-builder-1.0.14/src/builder-source-shell.c flatpak-builder-1.0.14-new/src/builder-source-shell.c
--- flatpak-builder-1.0.14/src/builder-source-shell.c	2021-06-08 19:49:23.000000000 +0800
+++ flatpak-builder-1.0.14-new/src/builder-source-shell.c	2022-07-05 11:31:53.989694000 +0800
@@ -136,7 +136,7 @@
 
   source_dir_path_canonical = realpath (source_dir_path, NULL);
 
-  g_ptr_array_add (args, g_strdup ("--nofilesystem=host"));
+  g_ptr_array_add (args, g_strdup ("--nofilesystem=host:reset"));
   g_ptr_array_add (args, g_strdup_printf ("--filesystem=%s", source_dir_path_canonical));
 
   if (env)