diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c
index 66dfc29217..dbe7784eae 100644
--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -1519,7 +1519,7 @@ static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch,
 static int count_mantissa_bits(AC3EncodeContext *s)
 {
     int ch, max_end_freq;
-    LOCAL_ALIGNED_16(uint16_t, mant_cnt,[AC3_MAX_BLOCKS][16]);
+    LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]);
 
     count_mantissa_bits_init(mant_cnt);