diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index cd83448c04e958e1adbfc99494b9bc6f96a45ac1..d75091e73fcba9720c165bb1f07403bdbc6cbba6 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -121,7 +121,7 @@ add_custom_target( Clean-All COMMAND ${CMAKE_BUILD_TOOL} clean )
 
 # **************************** Install ****************************
 
-if ( NOT ${MILVUS_DB_PATH} )
+if ( NOT MILVUS_DB_PATH )
     set( MILVUS_DB_PATH "${CMAKE_INSTALL_PREFIX}" )
 endif ()