diff --git a/CMakeLists.txt b/CMakeLists.txt
index cd727b8..765c2b3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,10 +38,12 @@ if (BUILD_DARWIN)
   set (CMD_CPPFLAGS "-I${CMAKE_BINARY_DIR}/include")
 elseif (BUILD_JS)
   set (EMSCRIPTEN_FLAGS
-   "-s USE_ZLIB=1 -s USE_LIBPNG=1 -s USE_SDL=2 -s USE_SDL_IMAGE=2 -s SDL2_IMAGE_FORMATS=['png'] -s USE_OGG=1 -s USE_VORBIS=1 -s TOTAL_MEMORY=256MB -s WASM=1"
+   "-s USE_ZLIB=1 -s USE_LIBPNG=1 -s USE_SDL=2 -s USE_SDL_IMAGE=2 -s SDL2_IMAGE_FORMATS=['png'] -s USE_OGG=1 -s USE_VORBIS=1 -s TOTAL_MEMORY=256MB"
   )
   if (ASMJS)
     set (EMSCRIPTEN_FLAGS "${EMSCRIPTEN_FLAGS} -s WASM=0")
+  else ()
+    set (EMSCRIPTEN_FLAGS "${EMSCRIPTEN_FLAGS} -s WASM=1")
   endif ()
   set (CMD_CXXFLAGS ${EMSCRIPTEN_FLAGS})
   set (CMD_CFLAGS ${EMSCRIPTEN_FLAGS})