diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
index 311109b4c3..e2fec93f8f 100644
--- a/libavcodec/pngdec.c
+++ b/libavcodec/pngdec.c
@@ -624,7 +624,7 @@ static av_cold int png_dec_init(AVCodecContext *avctx)
     avcodec_get_frame_defaults(&s->picture1);
     avcodec_get_frame_defaults(&s->picture2);
 
-#ifdef HAVE_MMX
+#if HAVE_MMX
     ff_png_init_mmx(s);
 #endif