diff --git a/CMakeLists.txt b/CMakeLists.txt
index f2ec9f3316b..2e33a127807 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -239,10 +239,8 @@ else ()
     set (CMAKE_CXX_STANDARD_REQUIRED ON)
 endif ()
 
-if (NOT ARCH_ARM)
-    set (CMAKE_CXX_FLAGS_RELWITHDEBINFO      "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -O3")
-    set (CMAKE_C_FLAGS_RELWITHDEBINFO        "${CMAKE_C_FLAGS_RELWITHDEBINFO} -O3")
-endif ()
+set (CMAKE_CXX_FLAGS_RELWITHDEBINFO      "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -O3")
+set (CMAKE_C_FLAGS_RELWITHDEBINFO        "${CMAKE_C_FLAGS_RELWITHDEBINFO} -O3")
 
 option (DEBUG_WITHOUT_DEBUG_INFO "Set to ON to build dev target without debug info (remove flag `-g` in order to accelerate compiling speed and reduce target binary size)" OFF)
 if (DEBUG_WITHOUT_DEBUG_INFO)