diff --git a/knowhere/archive/KnowhereConfig.h b/knowhere/archive/KnowhereConfig.h
index 3d3d8f761..52846e124 100644
--- a/knowhere/archive/KnowhereConfig.h
+++ b/knowhere/archive/KnowhereConfig.h
@@ -34,7 +34,7 @@ class KnowhereConfig {
     /**
      * set knowhere index_file_slice_size
      */
-    void
+    static void
     SetIndexFileSliceSize(const int64_t size);
 
     /**