diff --git a/proxy_components/proxy_ffi/src/encryption_impls.rs b/proxy_components/proxy_ffi/src/encryption_impls.rs
index 3b82de30487..6350cecfb6d 100644
--- a/proxy_components/proxy_ffi/src/encryption_impls.rs
+++ b/proxy_components/proxy_ffi/src/encryption_impls.rs
@@ -167,17 +167,21 @@ pub extern "C" fn ffi_handle_link_file(
     }
 }
 
-//// The following functions will not be called, just for compatibility ////
+// The CloudStorageEngineFFI contains dummy implementation of
+// CloudStorageEngine-specific FFI, not used, just for tiflash compilation.
+pub struct CloudStorageEngineFFI {}
 
-// always return false
-pub extern "C" fn ffi_get_keyspace_encryption(
-    _proxy_ptr: RaftStoreProxyPtr,
-    _keyspace_id: u32,
-) -> bool {
-    return false;
-}
+impl CloudStorageEngineFFI {
+    // always return false
+    pub extern "C" fn ffi_get_keyspace_encryption(
+        _proxy_ptr: RaftStoreProxyPtr,
+        _keyspace_id: u32,
+    ) -> bool {
+        return false;
+    }
 
-// always return empty string
-pub extern "C" fn ffi_get_master_key(_proxy_ptr: RaftStoreProxyPtr) -> RawCppStringPtr {
-    get_engine_store_server_helper().gen_cpp_string(b"")
+    // always return empty string
+    pub extern "C" fn ffi_get_master_key(_proxy_ptr: RaftStoreProxyPtr) -> RawCppStringPtr {
+        get_engine_store_server_helper().gen_cpp_string(b"")
+    }
 }
diff --git a/proxy_components/proxy_ffi/src/raftstore_proxy_helper_impls.rs b/proxy_components/proxy_ffi/src/raftstore_proxy_helper_impls.rs
index e7f66135017..32b533dccd4 100644
--- a/proxy_components/proxy_ffi/src/raftstore_proxy_helper_impls.rs
+++ b/proxy_components/proxy_ffi/src/raftstore_proxy_helper_impls.rs
@@ -65,8 +65,8 @@ impl RaftStoreProxyFFIHelper {
             fn_handle_new_file: Some(ffi_handle_new_file),
             fn_handle_delete_file: Some(ffi_handle_delete_file),
             fn_handle_link_file: Some(ffi_handle_link_file),
-            fn_get_keyspace_encryption: Some(ffi_get_keyspace_encryption),
-            fn_get_master_key: Some(ffi_get_master_key),
+            fn_get_keyspace_encryption: Some(CloudStorageEngineFFI::ffi_get_keyspace_encryption),
+            fn_get_master_key: Some(CloudStorageEngineFFI::ffi_get_master_key),
             fn_handle_batch_read_index: Some(ffi_batch_read_index),
             sst_reader_interfaces: SSTReaderInterfaces {
                 fn_get_sst_reader: Some(ffi_make_sst_reader),