diff --git a/build/CMakeLists.txt b/build/CMakeLists.txt
index bc65b41e..4100c23f 100644
--- a/build/CMakeLists.txt
+++ b/build/CMakeLists.txt
@@ -147,7 +147,10 @@ else()
   set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -pedantic")
   # TODO: The following is incompatible with static build and enabled hardening for OpenWRT.
   # Multiple definitions of __stack_chk_fail(libssp & libc)
-  set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} -flto -s -ffunction-sections -fdata-sections")
+  if(NOT CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+    set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} -flto -s")
+  endif()
+  set(CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL} -ffunction-sections -fdata-sections")
   set(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL "-Wl,--gc-sections") # -flto is added from above
 
   # check for c++17 & c++11 support