diff --git a/libavcodec/x86/fdct_mmx.c b/libavcodec/x86/fdct_mmx.c
index 77652b213d..94f61574aa 100644
--- a/libavcodec/x86/fdct_mmx.c
+++ b/libavcodec/x86/fdct_mmx.c
@@ -68,7 +68,7 @@ DECLARE_ALIGNED(16, static const int16_t, fdct_one_corr)[8] = { X8(1) };
 
 DECLARE_ALIGNED(8, static const int32_t, fdct_r_row)[2] = {RND_FRW_ROW, RND_FRW_ROW };
 
-static struct
+static const struct
 {
  DECLARE_ALIGNED(16, const int32_t, fdct_r_row_sse2)[4];
 } fdct_r_row_sse2 =