diff --git a/sandboxed_api/sandbox2/mounts.cc b/sandboxed_api/sandbox2/mounts.cc
index ace7148..7f897c3 100644
--- a/sandboxed_api/sandbox2/mounts.cc
+++ b/sandboxed_api/sandbox2/mounts.cc
@@ -589,6 +589,7 @@ void RecursivelyListMountsImpl(const MountTree& tree,
     inside_entries->emplace_back(absl::StrCat(rw_str, tree_path));
     outside_entries->emplace_back(absl::StrCat(node.file_node().outside()));
   } else if (node.has_tmpfs_node()) {
+    inside_entries->emplace_back(tree_path);
     outside_entries->emplace_back(
         absl::StrCat("tmpfs: ", node.tmpfs_node().tmpfs_options()));
   }
diff --git a/sandboxed_api/sandbox2/mounts_test.cc b/sandboxed_api/sandbox2/mounts_test.cc
index e026648..f2c95e1 100644
--- a/sandboxed_api/sandbox2/mounts_test.cc
+++ b/sandboxed_api/sandbox2/mounts_test.cc
@@ -205,6 +205,8 @@ TEST(MountTreeTest, TestList) {
     }
   }
 
+  ASSERT_THAT(mounts.AddTmpfs(file::CleanPath("/d"), 1024 * 1024), IsOk());
+
   std::vector<std::string> outside_entries;
   std::vector<std::string> inside_entries;
   mounts.RecursivelyListMounts(&outside_entries, &inside_entries);
@@ -219,6 +221,7 @@ TEST(MountTreeTest, TestList) {
           "R /h",
           "W /i/j/k",
           "W /i/l/",
+          "/d",
       }));
   EXPECT_THAT(
       outside_entries,
@@ -229,6 +232,7 @@ TEST(MountTreeTest, TestList) {
           absl::StrCat("/some/dir/", "h"),
           absl::StrCat("/some/dir/", "i/j/k"),
           absl::StrCat("/some/dir/", "i/l/"),
+          absl::StrCat("tmpfs: size=", 1024*1024),
       }));
   // clang-format on
 }