diff --git a/scripts/waifulib/sdl2.py b/scripts/waifulib/sdl2.py
index 115d9972..d4c943ac 100644
--- a/scripts/waifulib/sdl2.py
+++ b/scripts/waifulib/sdl2.py
@@ -83,12 +83,21 @@ def configure(conf):
 	else:
 		libname = 'SDL2'
 
-	HAVE = 'HAVE_'+libname
+	HAVE          = 'HAVE_' + libname
+	CFLAGS        = 'CFLAGS_' + libname
+	CXXFLAGS      = 'CFLAGS_' + libname
+	LINKFLAGS     = 'LINKFLAGS_' + libname
 
 	if conf.options.SDL_PATH:
 		sdl2_configure_path(conf, conf.options.SDL_PATH, libname)
 	elif conf.env.DEST_OS == 'darwin' and conf.options.SDL_USE_PKGCONFIG == False:
 		sdl2_configure_path(conf, '/Library/Frameworks/%s.framework' % libname, libname)
+	elif conf.env.DEST_OS == 'emscripten':
+		flag = '-sUSE_SDL=%d' % (3 if conf.options.SDL3 else 2)
+		conf.env[HAVE] = 1
+		conf.env[CFLAGS] = [flag]
+		conf.env[CXXFLAGS] = [flag]
+		conf.env[LINKFLAGS] = [flag]
 	else:
 		try:
 			conf.check_cfg(package=libname.lower(), args='--cflags --libs',