diff --git a/fs_mgr/fs_mgr.cpp b/fs_mgr/fs_mgr.cpp
index 9f52f44..88e26cf 100644
--- a/fs_mgr/fs_mgr.cpp
+++ b/fs_mgr/fs_mgr.cpp
@@ -858,6 +858,10 @@
         if (!android::base::Realpath(source, &real_source)) {
             real_source = source;
         }
+
+        // Clear errno prior to calling `mount`, to avoid clobbering with any errno that
+        // may have been set from prior calls (e.g. realpath).
+        errno = 0;
         ret = mount(real_source.c_str(), target.c_str(), entry.fs_type.c_str(), mountflags,
                     opts.c_str());
         save_errno = errno;