diff --git a/contrib/aws-cmake/CMakeLists.txt b/contrib/aws-cmake/CMakeLists.txt
index 5b447865db6..abde20addaf 100644
--- a/contrib/aws-cmake/CMakeLists.txt
+++ b/contrib/aws-cmake/CMakeLists.txt
@@ -52,8 +52,6 @@ if (USE_S2N)
     list(APPEND AWS_PRIVATE_COMPILE_DEFS "-DUSE_S2N")
 endif()
 
-list(APPEND AWS_PRIVATE_COMPILE_DEFS "-O0")
-
 
 # Directories.
 SET(AWS_SDK_DIR "${ClickHouse_SOURCE_DIR}/contrib/aws")