diff --git a/libavcodec/dct.h b/libavcodec/dct.h
index 17c881a695..17135207bd 100644
--- a/libavcodec/dct.h
+++ b/libavcodec/dct.h
@@ -27,11 +27,11 @@
 #include <stddef.h>
 #include <stdint.h>
 
-void ff_j_rev_dct(int16_t *data);
-void ff_j_rev_dct4(int16_t *data);
-void ff_j_rev_dct2(int16_t *data);
-void ff_j_rev_dct1(int16_t *data);
-void ff_jref_idct_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block);
-void ff_jref_idct_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block);
+void ff_j_rev_dct(int16_t data[64]);
+void ff_j_rev_dct4(int16_t data[64]);
+void ff_j_rev_dct2(int16_t data[64]);
+void ff_j_rev_dct1(int16_t data[64]);
+void ff_jref_idct_put(uint8_t *dest, ptrdiff_t line_size, int16_t block[64]);
+void ff_jref_idct_add(uint8_t *dest, ptrdiff_t line_size, int16_t block[64]);
 
 #endif /* AVCODEC_DCT_H */
diff --git a/libavcodec/jrevdct.c b/libavcodec/jrevdct.c
index 7f1863515f..531deee3a9 100644
--- a/libavcodec/jrevdct.c
+++ b/libavcodec/jrevdct.c
@@ -1159,13 +1159,13 @@ void ff_j_rev_dct1(DCTBLOCK data){
 #undef FIX
 #undef CONST_BITS
 
-void ff_jref_idct_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
+void ff_jref_idct_put(uint8_t *dest, ptrdiff_t line_size, int16_t block[64])
 {
     ff_j_rev_dct(block);
     ff_put_pixels_clamped_c(block, dest, line_size);
 }
 
-void ff_jref_idct_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
+void ff_jref_idct_add(uint8_t *dest, ptrdiff_t line_size, int16_t block[64])
 {
     ff_j_rev_dct(block);
     ff_add_pixels_clamped_c(block, dest, line_size);