diff --git a/Makefile.emscripten b/Makefile.emscripten
index f333a32957..09c5b15468 100644
--- a/Makefile.emscripten
+++ b/Makefile.emscripten
@@ -3,7 +3,7 @@ TARGET = retroarch.js
 OS = Emscripten
 OBJ :=
 DEFINES := -DRARCH_INTERNAL -DHAVE_OVERLAY -DHAVE_MAIN
-DEFINES += -DHAVE_OPENGL -DHAVE_OPENGLES -DHAVE_OPENGLES2 -DHAVE_EGL -DHAVE_OVERLAY -DHAVE_GLSL -DHAVE_FILTERS_BUILTIN
+DEFINES += -DHAVE_OPENGL -DHAVE_OPENGLES -DHAVE_OPENGLES2 -DHAVE_EGL -DHAVE_OVERLAY -DHAVE_GLSL -DHAVE_SDL2 -DHAVE_FILTERS_BUILTIN
 
 HAVE_EGL    = 1
 HAVE_OPENGL = 1
@@ -11,6 +11,7 @@ HAVE_GLES = 1
 HAVE_EMSCRIPTEN = 1
 HAVE_RGUI = 1
 HAVE_SDL = 0
+HAVE_SDL2 = 0
 HAVE_ZLIB = 1
 HAVE_FBO = 1
 WANT_ZLIB = 1
@@ -23,6 +24,8 @@ ifneq ($(NATIVE_ZLIB),)
    WANT_ZLIB = 0
 endif
 
+#if you compil with SDL2 flag add this Emscripten flag "-s USE_SDL=2" to LDFLAGS:
+
 LIBS    :=
 LDFLAGS := -L. --no-heap-copy -s USE_ZLIB=1 -s TOTAL_MEMORY=$(MEMORY) -s OUTLINING_LIMIT=50000 \
            -s EXPORTED_FUNCTIONS="['_main', '_malloc', '_cmd_savefiles', '_cmd_save_state', '_cmd_load_state', '_cmd_take_screenshot']" \