diff --git a/fs_mgr/libfstab/fstab.cpp b/fs_mgr/libfstab/fstab.cpp
index 21d2e2ef3..d344b2d19 100644
--- a/fs_mgr/libfstab/fstab.cpp
+++ b/fs_mgr/libfstab/fstab.cpp
@@ -39,6 +39,10 @@
 #include "fstab_priv.h"
 #include "logging_macros.h"
 
+#if !defined(MS_LAZYTIME)
+#define MS_LAZYTIME (1 << 25)
+#endif
+
 using android::base::EndsWith;
 using android::base::ParseByteCount;
 using android::base::ParseInt;
@@ -74,6 +78,7 @@ FlagList kMountFlagsList[] = {
         {"private", MS_PRIVATE},
         {"slave", MS_SLAVE},
         {"shared", MS_SHARED},
+        {"lazytime", MS_LAZYTIME},
         {"defaults", 0},
 };
 
diff --git a/fs_mgr/tests/fs_mgr_test.cpp b/fs_mgr/tests/fs_mgr_test.cpp
index bd3d6b532..6522c02e8 100644
--- a/fs_mgr/tests/fs_mgr_test.cpp
+++ b/fs_mgr/tests/fs_mgr_test.cpp
@@ -37,6 +37,10 @@
 using namespace android::fs_mgr;
 using namespace testing;
 
+#if !defined(MS_LAZYTIME)
+#define MS_LAZYTIME (1 << 25)
+#endif
+
 namespace {
 
 const std::string cmdline =
@@ -329,6 +333,7 @@ TEST(fs_mgr, fs_mgr_read_fstab_file_proc_mounts) {
                 {"private", MS_PRIVATE},
                 {"slave", MS_SLAVE},
                 {"shared", MS_SHARED},
+                {"lazytime", MS_LAZYTIME},
                 {"defaults", 0},
                 {0, 0},
         };