diff --git a/data/org.freedesktop.portal.Flatpak.xml b/data/org.freedesktop.portal.Flatpak.xml
index f6617957..fcc84dc6 100644
--- a/data/org.freedesktop.portal.Flatpak.xml
+++ b/data/org.freedesktop.portal.Flatpak.xml
@@ -223,6 +223,14 @@
              This was added in version 3 of this interface (available from flatpak 1.6.0 and later).
              </para></listitem>
            </varlistentry>
+           <varlistentry>
+             <term>unset-env as</term>
+             <listitem><para>
+             A list of environment variables to unset (remove from the environment).
+             </para><para>
+             This was added in version 5 of this interface (available from flatpak 1.10.0 and later).
+             </para></listitem>
+           </varlistentry>
          </variablelist>
 
     -->
diff --git a/portal/flatpak-portal.c b/portal/flatpak-portal.c
index 61bb9dac..7887c57a 100644
--- a/portal/flatpak-portal.c
+++ b/portal/flatpak-portal.c
@@ -775,6 +775,7 @@ handle_spawn (PortalFlatpak         *object,
   g_auto(GStrv) shares = NULL;
   g_auto(GStrv) sockets = NULL;
   g_auto(GStrv) devices = NULL;
+  g_auto(GStrv) unset_env = NULL;
   g_auto(GStrv) sandbox_expose = NULL;
   g_auto(GStrv) sandbox_expose_ro = NULL;
   g_autoptr(GVariant) sandbox_expose_fd = NULL;
@@ -874,6 +875,7 @@ handle_spawn (PortalFlatpak         *object,
   g_variant_lookup (arg_options, "sandbox-flags", "u", &sandbox_flags);
   sandbox_expose_fd = g_variant_lookup_value (arg_options, "sandbox-expose-fd", G_VARIANT_TYPE ("ah"));
   sandbox_expose_fd_ro = g_variant_lookup_value (arg_options, "sandbox-expose-fd-ro", G_VARIANT_TYPE ("ah"));
+  g_variant_lookup (arg_options, "unset-env", "^as", &unset_env);
 
   if ((sandbox_flags & ~FLATPAK_SPAWN_SANDBOX_FLAGS_ALL) != 0)
     {
@@ -1126,6 +1128,30 @@ handle_spawn (PortalFlatpak         *object,
                                         child_setup_data.env_fd));
     }
 
+  for (i = 0; unset_env != NULL && unset_env[i] != NULL; i++)
+    {
+      const char *var = unset_env[i];
+
+      if (var[0] == '\0')
+        {
+          g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
+                                                 G_DBUS_ERROR_INVALID_ARGS,
+                                                 "Environment variable cannot have empty name");
+          return G_DBUS_METHOD_INVOCATION_HANDLED;
+        }
+
+      if (strchr (var, '=') != NULL)
+        {
+          g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR,
+                                                 G_DBUS_ERROR_INVALID_ARGS,
+                                                 "Environment variable name cannot contain '='");
+          return G_DBUS_METHOD_INVOCATION_HANDLED;
+        }
+
+      g_ptr_array_add (flatpak_argv,
+                       g_strdup_printf ("--unset-env=%s", var));
+    }
+
   expose_pids = (arg_flags & FLATPAK_SPAWN_FLAGS_EXPOSE_PIDS) != 0;
   share_pids = (arg_flags & FLATPAK_SPAWN_FLAGS_SHARE_PIDS) != 0;