diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2cc8149..ce1be0e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -154,7 +154,8 @@ function(give_options_without_warnings target)
         set(BUILD_FLAGS_RELEASE
                 -O3
                 -flto=$<IF:$<STREQUAL:${CMAKE_C_COMPILER_ID},Clang>,thin,auto>
-                -mavx -mavx2
+                $<$<STREQUAL:${CMAKE_SYSTEM_PROCESSOR},AMD64>:-sse2 -mavx -mavx2>
+                $<$<BOOL:${EMSCRIPTEN}>:-msimd128 -mrelaxed-simd>
                 -funroll-loops
                 -fomit-frame-pointer
                 $<$<STREQUAL:${CMAKE_C_COMPILER_ID},Gnu>:-s>)