diff --git a/fs_mgr/libdm/dm.cpp b/fs_mgr/libdm/dm.cpp
index 3a9ed9b..e261aa3 100644
--- a/fs_mgr/libdm/dm.cpp
+++ b/fs_mgr/libdm/dm.cpp
@@ -612,8 +612,12 @@
 
 std::optional<std::string> ExtractBlockDeviceName(const std::string& path) {
     static constexpr std::string_view kDevBlockPrefix("/dev/block/");
-    if (android::base::StartsWith(path, kDevBlockPrefix)) {
-        return path.substr(kDevBlockPrefix.length());
+    std::string real_path;
+    if (!android::base::Realpath(path, &real_path)) {
+        real_path = path;
+    }
+    if (android::base::StartsWith(real_path, kDevBlockPrefix)) {
+        return real_path.substr(kDevBlockPrefix.length());
     }
     return {};
 }
diff --git a/fs_mgr/libdm/include/libdm/dm.h b/fs_mgr/libdm/include/libdm/dm.h
index 3e7ecc6..22c475f 100644
--- a/fs_mgr/libdm/include/libdm/dm.h
+++ b/fs_mgr/libdm/include/libdm/dm.h
@@ -52,8 +52,8 @@
 
 static constexpr uint64_t kSectorSize = 512;
 
-// Returns `path` without /dev/block prefix if and only if `path` starts with
-// that prefix.
+// Returns `path` without /dev/block prefix if `path` starts with that prefix.
+// Or, if `path` is a symlink, do the same with its real path.
 std::optional<std::string> ExtractBlockDeviceName(const std::string& path);
 
 // This interface is for testing purposes. See DeviceMapper proper for what these methods do.