diff --git a/libavcodec/4xm.c b/libavcodec/4xm.c
index 5547dfd87f..7440dccf1f 100644
--- a/libavcodec/4xm.c
+++ b/libavcodec/4xm.c
@@ -145,7 +145,7 @@ typedef struct FourXContext {
     int mv[256];
     VLC pre_vlc;
     int last_dc;
-    DECLARE_ALIGNED(16, int16_t, block)[6][64];
+    DECLARE_ALIGNED(32, int16_t, block)[6][64];
     void *bitstream_buffer;
     unsigned int bitstream_buffer_size;
     int version;