diff --git a/cpp/src/db/MemTableFile.h b/cpp/src/db/MemTableFile.h
index 4d0011b362..36d5c1bb25 100644
--- a/cpp/src/db/MemTableFile.h
+++ b/cpp/src/db/MemTableFile.h
@@ -5,7 +5,6 @@
 #include "VectorSource.h"
 #include "ExecutionEngine.h"
 
-
 namespace zilliz {
 namespace milvus {
 namespace engine {
diff --git a/cpp/src/db/VectorSource.h b/cpp/src/db/VectorSource.h
index 7092805a6d..9d2abec3cc 100644
--- a/cpp/src/db/VectorSource.h
+++ b/cpp/src/db/VectorSource.h
@@ -5,7 +5,6 @@
 #include "IDGenerator.h"
 #include "ExecutionEngine.h"
 
-
 namespace zilliz {
 namespace milvus {
 namespace engine {