diff --git a/generic/Emscripten-wasm.cmake b/generic/Emscripten-wasm.cmake
index f99c407..4caa417 100644
--- a/generic/Emscripten-wasm.cmake
+++ b/generic/Emscripten-wasm.cmake
@@ -78,3 +78,12 @@ set(CMAKE_CXX_FLAGS_INIT "-s WASM=1")
 set(CMAKE_EXE_LINKER_FLAGS_INIT "-s WASM=1")
 set(CMAKE_CXX_FLAGS_RELEASE_INIT "-DNDEBUG -O3")
 set(CMAKE_EXE_LINKER_FLAGS_RELEASE_INIT "-O3 --llvm-lto 1")
+
+if(EMSCRIPTEN_TARGET_THREADS)
+    list(APPEND CMAKE_CXX_FLAGS_INIT "-pthread")
+    list(APPEND CMAKE_EXE_LINKER_FLAGS_INIT "-pthread")
+endif()
+
+if(EMSCRIPTEN_TARGET_SIMD)
+    list(APPEND CMAKE_CXX_FLAGS_INIT "-msimd128")
+endif()