diff --git a/internal/proxy/meta_cache.go b/internal/proxy/meta_cache.go
index 24a1810bc0..e433735668 100644
--- a/internal/proxy/meta_cache.go
+++ b/internal/proxy/meta_cache.go
@@ -66,6 +66,8 @@ type partitionInfo struct {
 	createdUtcTimestamp uint64
 }
 
+var _ Cache = (*MetaCache)(nil)
+
 // MetaCache implements Cache, provides collection meta cache based on internal RootCoord
 type MetaCache struct {
 	client types.RootCoord