diff --git a/sdk/oldwebscan/hgscannersdk/CMakeLists.txt b/sdk/oldwebscan/hgscannersdk/CMakeLists.txt
index 325336c7..402f483d 100644
--- a/sdk/oldwebscan/hgscannersdk/CMakeLists.txt
+++ b/sdk/oldwebscan/hgscannersdk/CMakeLists.txt
@@ -5,8 +5,8 @@ if(CMAKE_HOST_SYSTEM_NAME MATCHES "Windows")
 endif()
 
 add_compile_options(-std=c++11)
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC -O2")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC -O2")
 aux_source_directory(${PROJECT_SOURCE_DIR}  DIR_SRCS)
 file(GLOB DIR_HEADS "${PROJECT_SOURCE_DIR}/*.h" "${PROJECT_SOURCE_DIR}/*.hpp")
 set(DIR_SRCS ${DIR_SRCS} ${DIR_HEADS})